I was not hearing to the teacher, or else I ___ his questions.
A. answered B. had answered C. would have answered C. have answered
Do you know since when it is ________ you have been interested in poetry?
| A．when | B．until | C．how | D．that |
What’s the __________ of having a public open space where you can’t eat, drink or even simply hang out for a while?
| A．sense | B．matter | C．case | D．opinion |
It is worth considering what makes “convenience” foods so popular, and_______ better ones of your own.
| A．introduces | B．to introduce | C．introducing | D．introduced |
Whose possession has the house _________ since the 1500s?
| A．taken | B．been taken | C．been in | D．come into |
The findings of the research, _________ on a lot of experiments, are convincing.
| A．to base | B．based | C．is based | D．basing |