______you may have，you should gather your courage to face the challenge.
A. However a serious problem
B. What a serious problem
C. However serious a problem
D. What serious a problem
31. ---Did you receive his call last night？I was disturbed several times.
---He ______ again. That’s his typical style.
A. should be blind drunk
B. may be blind drunk
C. must have been blind drunk
D. could have been blind drunk
His mind went so blank that little ______ down for the first ten minutes in the test.
A. he wrote B. he will write
C. did he write D. will he write
---Why was it ______ you were so angry？
---Because we failed to take part in the basketball match.
A. which B. that C. how D. when
The Bakers intend to buy a house but _____ must be within their power.
A.they B.one C.it D.which
Fully ______in preparing teaching assignment at school，she no longer has much time to enjoy the various activities as usual.
A. occupy B. occupying
C. occupied D. to occupy
