This type of bamboo grows very fast and it will take only three to five years _____ it can be used in various fields .
| A．before | B．since | C．when | D．as |
Do you know the reason he was late?
| A．for which | B．for what | C．which | D．that |
He must have ________ the funny story. I can’t believe that it’s true.
| A．picked up | B．turned up | C．done up | D．made up |
Alien had to call a taxi because the box was _____ to carry all the way home．
| A．much too heavy | B．too much heavy |
| C．heavy too much | D．too heavy much |
I was really anxious about you. You _______ home without a word．
| A．mustn’t leave | B．shouldn’t have left |
| C．couldn’t have left | D．needn’t leave |
The number of people invited ___fifty, but a number of them____ absent fordifferent reasons．
| A．were; was | B．was; was | C．was; were | D．were; were. |