1. I looked up and noticed a snake ________ its way up the tree to catch its breakfast.
A. to wind
B. wind
C. winding
D. wound
2. Mr. Green ________ my letter, otherwise he would have replied before now.
A. must have received
B. must have failed to receive
C. must receive
D. must fail to receive
3. Don’t run in the classroom, ________ you may hurt yourself.
A. and
B. or
C. but
D. so
4. Alice ________ her father that both she and her husband would be happy if he would live with them.
A. convinced
B. reinforced
C. pledged
D. required
5. The following ________ some other mental diseases.
A. being
B. are
C. was
D. were
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