He kept looking at her, wondering whether he _____ her somewhere.
A.saw | B.has seen | C.sees | D.had seen |
Not until Mary reads her composition the second time ___________the spelling mistake.
A.did she notice | B.she noticed | C.does she notice | D.she has noticed |
-Look! Someone __________sofa.
-Well,it wasn`t me.I didn`t do it
A.is cleaning | B.was cleaning | C.has cleaned | D.had cleaned |
.I was about to get on the bus __________my wife phoned me to back home at once.
A.when | B.while | C.until | D.after |
We must do what we can to ____________the river ______________.
A.protect; against polluting | B.stop; polluting |
C.keep; being polluted | D.prevent; from being polluted |
Paper produced every year is _______________the world`s production of vehicles.
A.three times the weight | B.the three times weight |
C.as three times heavy as | D.three times as heavier as |