Unluckily, not everyone has realized the important role the balance of nature _______ in their daily life.
A.makes B.plays C.acts D.does
The comments which he made _________ marketing bothered his boss greatly.
A.being concerned B.concerned
C.be concerned D.concerning
You can never imagine what great trouble I had ______ the poor boy and the little dog _____ were seriously hurt.
A.help; which B.to help; that C.helping; that D.helped; who
He said he had _______ all the books on the floor. In fact, he was _______.
A.lay; lying B.laid; lying C.lay; laying D.lied; laying
It was in the room ________ the old man is living now ________ Tom was born 20 years ago.
A.that; that B.where; where C.where; that D.that; where
Since 1949, the people’s living standard ____, causing a big ____ in population.
A.has been raised; rise B.has been risen; raise
C.has raised; rise D.has raised; rose
