Mrs. Smith finds it hard to clear up the mess, as her children are alwayswhenever she tries to.
| A． | in the way | B． | on watch | C． | in sight | D． | on the line |
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 |