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TedEd: What Causes Cavities? (Passive vs Active Voice Practice)

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Video quiz details

Task Description
I set this video up to practice passive vs active voice by means of 13 multiple choice questions. In some of the questions I picked verbs whose active form already implies sort of a passive meaning, e.g. "accumulate", "surge", "decline", and test whether students can decide between the passive and the active voice. In other questions I gapped passive voice constructs, and again check if students can guess the right form. I also included some advanced passive constructs, e.g. passive ellipsis: "When exposed to sugar ..." (=when it is exposed to ...), and "is to blame" (=has to be blamed). Because hearing the well-formed sentences is a huge help for students, I decided to make the task more difficult by mischievously letting the video play on after each gapped sentence to wipe out their hearing memories a bit. :) I think the biggest merit of such a video-based grammar quiz is to prompt students to pay attention to and notice certain grammar structures, which they may otherwise ignore when simply 'consuming' the content of a video.
Video details
Scene summary
This 5-minute TedEd video deals with the causes of cavities and how we can avoid them.
Video length
4 minutes 51 seconds
Video genre
Lectures (e.g. TED talks)
Language goals
Grammar practice
General topic
Grammar topic
Other pedagogical goals
The above lesson is a great teaching resource for:Upper-intermediate (B2), Advanced (C1)
Student type
This resource is intended for:High schoolers, Adults, Business/professional students
High schoolers
Business/professional students
Quality check
Quality not yet verified by the community.
This resource does not contain any images, words or ideas that would upset a reasonable person in any culture.
Copyright license
This resource is licensed by Kisdobos under the Creative Commons Attribution Share Alike License.
Upload date
Video quiz questions (printable)
1. Choose the correct options.
The teeth of those ancient humans ...
riddled holes
were riddled holes
were riddled by holes
were riddled with holes
2. Choose the correct options.
Our teeth naturally begin to ... communities of bacteria.
be accumulated
be accumulated by
3. Choose the correct options.
Diets high in sugary foods ... an explosion of bacteria.
are caused
were caused by
4. Choose the correct options.
Each human tooth ... in a hardy protective layer called enamel.
is coated
was coated
5. Choose the correct options.
The blood vessels and nerves ... deep within.
are enclosed
were enclosed
6. Choose the correct options.
Without treatment, the whole tooth ...
may infect
may infected
may become infecting
may become infected
7. Choose the correct options.
The more sugar our food contains, the more ...
our teeth put at risk
our teeth are put at risk
put our teeth at risk
risk we put our teeth
8. Choose the correct options.
When ... enzimes in the saliva, carbohydrates get broken down into simpler sugar.
exposes to
is exposed to
exposed by
exposed to
9. Choose the correct options.
The teeth of ancient humans ... sugars.
were still exposed to
were still exposed by
still exposed to
still exposed by
10. Choose the correct options.
After the industrial revolution, incidents of cavities ...
was surged
were surged
have been surged
11. Choose the correct options.
For most, high sugar consumption ...
is blamed
is blame
is to blame
12. Choose the correct options.
When cavities ..., we use fillings to close off the infected area.
are developed
do developed
do develop
13. Choose the correct options.
Gradually, the number of sugar loving bacteria in your mouth ...
will decline
will be declined
will declined
is to decline
Kisdobos is from/lives in Hungary and has been a member of iSLCollective since 2009-09-28. Kisdobos last logged in on 2023-01-26, and has shared 449 resources on iSLCollective so far.
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