—What’s the best time ________ a field trip?
—I think it’s spring.
| A．going on | B．to go on |
| C．go on | D．went on |
we’ll go to the zoo if ittomorrow.
A. won’t rain B. don’t rain C. doesn’t rain
What at nine o’clock last Sunday morning?
A. was you doingB. were you doingC. are they doing
If there are trees, the air in our city will be cleaner.
A. fewer, much B. more, more C. more, much
My sister can’t cook, I can’t, .
A. too B. also C. either
I hear she’ll be back a week.
A. after B. fromC. in