When the policeman stopped us, we all looked questioningly at him, ________.
| A．nervously and puzzled | B．nervous and puzzling |
| C．nervous and puzzled | D．nervously and puzzling |
It is pretty well understood_______controls the flow of carbon dioxide in and out of the atmosphere today．
| A．that | B．when | C．what | D．which |
Mary got into acting purely _____________.
| A．accidental | B．accident | C．by accident | D．with accident |
It is no use thinking about your ________ youth.
| A．gone | B．lost | C．missed | D．losing |
---Must he come to sign this paper himself?
---Yes．He______ ．
| A．need | B．must | C．may | D．will |
I wonder how he could __________ not handing in his maths exercises yesterday, for his maths teacher is always strict with his students.
| A．get along with | B．get down to | C．get away with | D．get around |