The biggest problem for most plants, which ______ just get up and run away when threatened, is that animals like to eat them.
| A．can’t | B．shan’t | C．needn’t | D．mustn’t |
Last night Mr. Crook didn’t come back at the usual time.______，he met some friends and stayed out until midnight.
| A．Meanwhile | B．However | C．Instead | D．Thus |
－Any information about your son?
－No，if only I______ those tough words to him．
| A．didn’t say | B．hadn’t said | C．shouldn’t have said | D．couldn’t have said |
—Do you let your kids travel alone at night?
—______!
| A．Forget it | B．Go ahead | C．Absolutely not | D．At any time |
She is the only one of the students who ____ praised by the teacher.
| A．is | B．are | C．has | D．have |
They talked for about an hour of things and persons _____ they remembered in the school.
| A．which | B．that | C．who | D．whom |