Pleasant music is often played_____classes to make students refreshed and relaxed for a while.
| A．between | B．among | C．over | D．after |
If you are in any doubt as to _____ you should be doing these exercises, consult your doctor.
| A．that | B．which | C．what | D．whether |
—When can I come for the photos? I need them tomorrow afternoon．
—They_______ be ready by 12：00．
| A．can | B．should | C．might | D．need |
Was it _____ she heard with her ears ____ really made her frightened?
| A．that; that | B．what; that | C．what; what | D．that; what |
Beneath our feet _____ that our life depends on for food and clothing.
| A．the earth lay | B．the earth lies |
| C．lies the earth | D．does the earth lie |
We must treasure every minute because _____ time is _____ forever.
| A．lost; losing | B．lost; lost |
| C．losing; losing | D．losing; lost |