A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
A.permission | B.penetration | C.imagination | D.convention |
Some insects ______ the colour of their surroundings to protect themselves.
A.take in | B.take off | C.take on | D.take up |
Mothers holding jobs outside the home should have _______ schedules to make it easier to care for their children.
A.heavy | B.smooth | C.flexible | D.complex |
We lost our way in that small village, otherwise we ________more places of interest yesterday.
A.visited | B.had visited |
C.would visit | D.would have visited |
Had it been possible I would have gone to the movies, but I ________________ busy.
A.had been | B.am | C.was | D.would be |
In some developed countries, larger population is ______________ in their big cities.
A.approved | B.gathered | C.concentrated | D.fixed |