Scientists study ________ human brains work to make computers.
A.when |
B.how |
C.that |
D.whether |
John can finish this task quickly ______ using better methods.
A.on | B.in | C.by | D.at |
It may be necessary to stop _____ in the learning process and go back to the difficult points in the lessons.
A.at intervals | B.at random |
C.at ease | D.at length |
The driver stopped his car so _____ that he was hit by the cab right behind him.
A.impolitely | B.violently |
C.abruptly | D.cautiously |
None of the students in the class likes the professor, who is used to being _____ of everything they do.
A.optimistic | B.criticaL |
C.interested | D.emotional |
Africa is a very _____ continent, with each country, or even each part of a country having its own unique culture.
A.diverse | B.abstract | C.remote | D.vacant |