—I have tried very hard to find a solution to the problem, but in vain.
—Why not discuss with Frank? You see, _________.
| A．two heads are better than one |
| B．a bird in the hand is worth two in the bush |
| C．it’s better to think twice before doing something |
| D．great minds think alike |
Perseverance is a kind of quality --- and that’s ________ it takes to do anything well.
| A．why | B．that | C．which | D．what |
A heavy learning burden leads to unhealthy behaviors such as poor eating habits, which ___ damage the health of students.
| A．in its turn | B．in return | C．in turn | D．by turns |
How did you ___ to paint the whole house in a week?
| A．try | B．manage | C．win | D．succeed |
Black clouds had completely ___ the sun.
| A．blocked off | B．broken out | C．blocked out | D．broken off |
It was an unpleasant subject ____ we _____ for a long time.
| A．about which…discussed | B．about which…argued |
| C．over them…argued | D．which…argued |