61.No one except Jack an Tom ___ the answer.

61.No one except Jack an Tom ___ the answer.
A.know B.knows C.is knowing D.are known
62.David is the only one of the people who ___ trouble making up their minds.
A.has B.have C.are D.have
63.Reading aloud ___ very important in learning a foreign language.
A.is B.are C.was D.were
64.Physics ___ a difficult subject to learn,I think.
A.is B.are C.was D.were
65.I was speaking to Ann on the phone when suddenly we were ___.
A.hung up B.hung back C.cut down D.cut off
66.___ your homework carefully,some spelling mistakes can be avoided.
A.Having checked B.Check C.If you check D.To check
67.You can still find bones of the birds ___ the used to live.
A.in the place B.in which C.where D.that
68.The head of the company promised to deal with maters of this sort ___ he returned to his office.
A.until B.by the time C.while D.the moment
69.___ before the examination,you are likely to pass it,I think.
A.Having worked harder B.Work harder
C.As long as you work harder D.While working harder
70.I would appreciate it ___ she can help me with my English this afternoon.
A.because B.until C.when D.if