1. 选择正确的时态填空：
She _______ (have) a meeting this afternoon, so she won't be able to join us.
A. is having
B. had
C. has
D. will have
2. 选择正确的冠词填空：
I have never _______ (see) such a beautiful sunset.
A. seen
B. saw
C. to see
D. seeing
3. 选择正确的介词填空：
The book is _______ (of) great importance for my study.
A. on
B. in
C. to
D. with
4. 选择正确的情态动词填空：
You _______ (not) come to the party if you feel unwell.
A. mustn't
B. needn't
C. can't
D. may not
5. 选择正确的连词填空：
He is a good student _______ he always works hard.
A. because
B. although
C. unless
D. if
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