People have planted a lot of trees and grass in order to ____ wind and sand in the desert.
A.hold down | B.hold up | C.hold back | D.hold out |
Why the explosion occurred was ____ the laboratory attendant had been careless.
A.for | B.because | C.since | D.that |
________ one foot before the other, slowly and purposefully, the deer walked up to ______ I was _______.
A.Put, where, seated | B.Putting, the place where, seating |
C.Put, the place in which, sitting | D.Putting, the place where, sitting |
This field of scientific research remains________.
A.to be untouching | B.being touched |
C.to be untouched | D.untouched |
The teacher just took down the names of the students _______ during the exam.
A.caught cheating | B.caught to cheat |
C.catching cheating | D.to catch cheating |
______ to get a seat for the concert, he didn’t mind standing in a queue all night.
A.Determine | B.To be determined |
C.Determined | D.Being determined |