We can hardly avoid making any mistakes in our work______ hard we try.

A. hence B. otherwise C. nevertheless D. therefore

A. so that B. if C. when D. although

A. since B. so that C. for D. because

A. in that B. in which C. in what D. because of which

A. so far as B. provided that C. unless D. except that

A. If B. Unless C. When D. Because

A. so B. if

C. for D. unless

A. enough tired to go to bed B. too tired to go to bed

C. so tired that he went to bed D. very tired, he went to bed

A. hardly B. the minute C. no sooner D. at once

A. when B. where C. though D. because