30.Frank’s marriage to the billionaire’s daughter got him through his hardest time, ________ years later he wondered what he could have done differently 。
A.therefore | B.and | C.however | D.but |
John promised his parents he _______ not smoke again, and he has not smoked ever since.
A.would | B.could | C.should | D.might |
My brother left home five years ago. I _______ nothing from him up to now.
A.hear | B.heard | C.have heard | D.had heard |
The power to our region has been _______ by the heavy snow.
A.cut off | B.cut down | C.cut away | D.cut up |
______more effectively with foreign firms, many Chinese firms have turned to new technology.
A.Being competed | B.To compete | C.Competing | D.Competed |
Those books ______ in brown paper are for the kids so that the kids will not easily tear them
up.
A.to do with | B.done up | C.being done | D.having done over |