"You ____be so tired that you had to stop to rest．"
| A．should | B．can't | C．must | D．mustn't |
This church is as old as, if _____ than, that one.
| A．no older | B．not older | C．no old | D．not old |
Her pronunciation is as good as, if ____than, her teacher's.
| A．no better | B．not better | C．no good | D．not good |
In that month, he earned as much as, if ____ than, $40 000.
| A．no more | B．not more | C．no much | D．not much |
The research is so designed that once _____ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
If _____ carefully, the experiment will be successful.
| A．do | B．does | C．done | D．doing |