20. The flu is believed________by viruses.
A.causing | B.being caused | C.to be caused | D.to cause |
Mr. Bake is a professor of phsics; ____, he is a famous writer.
A.in all | B.in brief | C.in fact | D.in addition |
I started into the darkness and wonderful if he was as_____my presence as I was of his.
A.aware of | B.aware that | C.quite aware | D.very aware |
He has ____of the team.
A.left out | B.left over | C.left alone | D.left off |
Though ____money, his parents managed to send him to university.
A.lacked | B.lacking of | C.lacking | D.lacked in |
Those who steal books in the library _____ not be allowed to borrow any again in the future.
A.shall | B.must | C.may | D.can |