_____ you may face, you must gather your courage to finish it.

[     ]

A. However a difficult task
B. What a difficult task
C. However difficult a task
D. What difficult a task
This is a very interesting book. I'll buy it, _____.
[     ]

A. how much may it cost
B. no matter how it may cost
C. however much it may cost
D. how may it cost

_____ hard you may try, you can't possibly persuade Tom to give up smoking, for he is so addicted to it.
[     ]
A. Whatever
B. However
C. Whichever
D. Whenever
When _____ to repairing a computer, I have little knowledge of it.

[     ]

A. I come
B. it comes
C. we come
D. they come
Mark promised me that he would tell Frank my message ______ he met him when he returned to school.

[      ]

A. now that
B. the moment
C. in case
D. even if
When you finish, please put the book back _____ it was.

[     ]

 A. where
B. at which
C. the place
D. the place that
— Did you remember to give her the book she asked for?
— Yes. ____ I saw her, I remembered.

[     ]

A. While
B. Once
C. The time
D. The moment
To tell you the truth, I don't quite like the way ______ she talks to her mother.

[     ]

A. by which
B. in that
C. /
D. on which
While watching TV,____.

[     ]

A. the door bell rang.
B. the door bell rings.
C. we heard the door bell ring.
D. we heard the door bell rings.
— Who should be responsible for the accident?
— The boss, not the workers. They just carried out the order _____.

[      ]

A. as told
B. as are told
C. as telling
D. as they told
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