I’m afraid our personal relationships__________over years may be lost after you move out.
A.building up | B.built up | C.having built up | D.to be built up |
Experiments of this kind __________ in both the U. S. and Europe well before the Second World War.
A.have conducted |
B.have been conducted |
C.had conducted |
D.had been conducted |
It's no use __________ without taking action.
A.complain |
B.complaining |
C.being complained |
D.to be complained |
Even the best writers sometimes find themselves __________ for words.
A.lose |
B.lost |
C.to lose |
D.having lost |
I am afraid he's more of a talker than a doer, which is __________ he never finishes anything.
A.that |
B.when |
C.where |
D.why |
Claire had her luggage __________ an hour before her plane left.
A.check |
B.checking |
C.to check |
D.checked |