Friendship is both ________ source of pleasure and ________ component of good health.
| A．a; a | B．/; / | C．the; a | D．a; the |
Of the three statements he has suggested __ the heating problem, I think the last one is the best.
| A．solving | B．to solve | C．to solving | D．solve |
It was very kind of you to do the washing-up but you _____ it
| A．needn’t do | B．shouldn’t do | C．mustn’t have done | D．needn’t have done |
Anyone providing information which leads to the recovery of the painting will be ________.
| A．appreciated | B．included | C．gained | D．rewarded |
He tried his best to solve the problem, _______ difficult it was.
| A．whatever | B．however | C．whichever | D．wherever |
With so many things _______, we haven’t decided on the final plan yet.
| A．considered | B．having considered | C．to consider | D．considering |