Those boys didn’t start the work ________ their teacher came back.
A. until B. while
C. as soon as D. if
He fell off the bike ________.
A. while he rode B. while he was riding
C. while he is riding D. while on bike
The students were all tired but ________ of them stopped ________.
A. no， to rest B. none， to rest
C. no， resting D. none， resting
—Can I see the headmaster at the moment， please ?
—I'm afraid not. He ________ out. He ________ in 10 minutes.
A. goes; comes
B. gone; came
C. will go; will come
D. has gone; will come back
Italy is famous for ________.
A. the Eiffel Tower B. the Pyramids
C. the Leaning Tower of Pisa D. The Thames River
There __________ great changes in our hometown in the past fifteen years.
A. has been B. have been
C. was D. were
