It’s hot ____________summer in Beijing.
A. by B. on C. at D. in
It’s a beautiful，sunny day! There ________ many people here on vacation.
A.be B.am C.is D.are
Don’t be afraid of asking for information ______it is needed.
A. when B. after C. although D. unless
There great changes in our city in the past 10 years.
A. were B. had C. have been D. have had
Hurry up!The play for ten minutes.
A.has begun B.began C.has been on D.has been
Look! The tree is growing well. When______?
A. was it planted B. did it plant
C. will it be planted D. is it planted[
