1.It was not until December 31 __________ we heard from him.
A.which B.when C.that D.then
2.At one time we had about eighty people here who did nothing but __________into various family history.
A.researched B.research C.researching D.to research
3.— How __________ will you be able to come back from you travel?
— In a couple of weeks,perhaps.
A.fast B.long C.often
4.Your hair needs __________.You’d better have it done tomorrow.
A.cut B.cutting C.to cut D.being cut
D.soon
5.When __________ to dinner at the White Rose Restaurant,he seemed very happy and accepted the invitation.
A.invited B.inviting C.to be invited D.having invited