The experiment shows that proper amounts of exercise, if regularly, can improve our health.
| A．being carried out | B．carried out |
| C．carrying out | D．to carry out |
I fell asleep while working on this paper ______ the computer on．
| A．as | B．for | C．over | D．with |
______ me when you get it through and I’ll pick you up at your work place．
| A．Calling | B．Call |
| C．Called | D．To call |
It is good manners to eat up ______ is left in your plate．
| A．that | B．what | C．which | D．all |
——These grapes look really beautiful．
——They ______！See the price，$3．99 a pound．Very expensive，aren’t they！
| A．would | B．could | C．might | D．should |
A huge amount of oil was spilt on the East Sea，the causes of ________ are still under investigation．
| A．it | B．that | C．which | D．whom |