1.The president requested that the committee( )the problem more carefully.

1.The president requested that the committee( )the problem more carefully.
A.studied B.study
C.would study D.must study
2.The volunteers who have （ ） good knowledge of ( ) English language made a great contribution
to the overall success of the 2008 Olympics.
A.两空均不填 B.a;不填
C.a;the D.the;the
3.There were ( )many grammer mistakes in Tom's essay ( )the professor told him to write it again.
A.so;that B.such;that C.such;as D.so;as