A driver should __ the road when .
| A．concentrate on; drive | B．concentrate in; driving |
| C．concentrate to; drove | D．concentrate on; driving |
My colour TV set is only one year old and it is still under _____.
| A．repair | B．safety | C．control | D．guarantee |
— Can you help me with the maths homework, mom?
— You can’t always ____ other’s help for your homework. Do it by yourself this time, Dear.
| A．wait on | B．rest on | C．insist on | D．turn on |
This kind of plant is ______ to the changes of the temperature. So you should keep it from freezing.
| A．available | B．valuable | C．sensitive | D．creative |
A large sum of money has been raised for the ______ of the poorly-educated children in the mountainous districts.
| A．sacrifice | B．favour | C．advantage | D．benefit |
He was in poor health, so the doctor________ him to drink wine.
| A．required | B．demanded | C．forbade | D．prevented |