From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
A. when B. until C. since D. before
_____ unemployment and crime are high, it can be assumed that the latter is due to the former.
A. Before B. Where C. Unless D. Until
_____the Internet is of great help, I don’t think it ‘s a good idea to spend too much time on it.
A. If B. While C. Because D. As
It was a matter of________ would take the position.
A. who B. whoever C. whom D. whomever
In China, all the students work hard at school _________ going to university for higher education in the future.
A. in the habit of B. in the hope of
C. in search of D. in honor of
Robert is said ___________ abroad, but I don’t know what country he studied in.
A . to have studied B. to be studying
C. to study D. to have been studying
