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 |
If you don’t pay your Internet fee on time, your line will be ________.
| A．cut off | B．cut down | C．cut in | D．cut up |