-- Tom, how about going for a picnic this weekend?--- _________. I love getting close to nature.
There is no doubt _________ the world climate has been changing in recent years.
Will you help him________ you see an old man in trouble ?
I usually do my homework after dinner until 10 pm, ______ is my bedtime.
We are told that more new teaching buildings ________ next year.
It is no use _______ about the coming exam. A. worry B worrying C worried D to worry