Where's Tom? His mother ______ him now.
| A．is looking for | B．will look for | C．has looked for | D．looks for |
What way can you think of ______ the mice in the room?
| A．how to kill | B．to kill | C．killing | D．killed |
Yuan Longping, a great person in China, _____as “father of hybrid rice”
| A．is regarded | B．has regarded | C．is regarding | D．regards |
______ the work is difficult, all the workers are keeping on working .
| A．But | B．Although | C．And | D．So |
Tom often makes his brother___but yesterday he was made___ by his brother.
| A．cry; to cry | B．to cry; cry | C．cry; cry | D．to cry; to cry |
— May we go home mow ?
— No, you____. You____ to go home until5 o’clock.
| A．mustn’t; are allowed | B．don’t have to; are supposed |
| C．needn’t; aren’t allowed | D．can’t; aren't supposed |