The hero said he didn’t think twice ____ diving into the freezing river to rescue that child.
| A．before | B．after | C．until | D．when |
"You ____be so tired that you had to stop to rest．"
| A．should | B．can't | C．must | D．mustn't |
He must have finished the work yesterday, ____ he ?
| A．mustn't | B．haven't | C．didn't | D．hasn't |
Is there a shop aroun ____ we can buy some toilet articles?
| A．that | B．which | C．where | D．what |
He must have lived here for 10 years, ____ he?
| A．mustn't | B．haven't | C．didn't | D．hasn't |
___ smoking here will be fined.
| A．Who | B．Whoever | C．Anyone | D．Who ever |