Not one of the students ...............the answer to that difficult problem
A.know
B.knows
C.is knowing
D.has known

We will wait until he shows up
A.appears
B.answers
C.speaks
D.finishes

______(2)
A.between
B.of
C.among
D.Both A and B

______(4)
A.his
B.the
C.Both A and B
D.them

______(5)
A.course
B.term
C.final
D.examination

Which of the following can best replace “in flux” ?
A.breaking
B.producing
C.changing
D.increasing

He never has enough money.
A.He's always short of money.
B.He's always lack of money he's always broke.
C.He's always enough money.
D.Both A and B

My French friend finds driving on the left difficult.
A.My french friend isn't used to drive on the left.
B.My french friend isn't used to be driven on the left.
C.My french friend isn't used to driving on the left.
D.My french friend isn't used to drive on the left.

The flight to Moscow lasted three and half hours.
A.It took three and half hours flied to Moscow.
B.It took three and half hours to fly to Moscow.
C.It took three and half hours flying to Moscow.
D.It took three and half hours fly to Moscow.

Rich as he was, he never helped the poor.
A.No matter how rich he was, he never helped the poor.
B.No matter what rich he was, he never helped the poor.
C.No matter how rich he had been, he never helped the poor.
D.No matter how rich he was, he had never helped the poor.