______ for a long time, but he managed to catch up with his classmates at last.
A. Having been ill B. Being ill C. He was ill D. Though ill
--Excuse me, what time is it now?
--Sorry, my watch ___. It __ at the shop.
A. isn't working; is being repaired
B. doesn't work; is being repaired
C. isn't working; is repaired
D. doesn't work; is repaired
Great measures ______ to prevent the air pollution, but the sky is still not clear.
A. is taken B. are taken
C. has been taken D. have been taken
His stepmother did what she could _____ him．
A．help B．helping C．to help D．in helping
Do you know the most interesting story __________ took place long ago．
A．which B．that C．who D．×
Living in a house on a mountain top ______ be rather cold,
especially in winter.
A. can B.
shall C. need D.
should
