.I soon found that the work I was doing had already been done by someone else - ________, I was wasting my time.
If he _______ his leg in the last training, he _______ the coming London Olympics, which he has been longing to compete in.
Because he is ______head of the government, he is supposed ______.
— What is that building ______ construction ? — It looks like a hospital..
Honestly speaking, I would agree with Shirley, though not ______.
Every possible means ______ to prevent the air pollution, but the sky is still not clear.