The glass doors have taken the place of the wooden ones at the entrance，________in the natural light during the day.
| A．to let |
| B．letting |
| C．let |
| D．having let |
I’ve spare ___ juice for you, and your half ____ in the refrigerator.
| A．half the, is | B．the half, are | C．my half, is | D．a half, are |
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 |