A. exercise B. operations C. research D. experiments

【题目】We should do what we can ________ the hunters ________ the animals.
A.to prevent; killing
B.to prevent; to kill
C.prevent; killing
D.prevent; to kill

【题目】—Can I have some ________ ? —Sure, Here it is.
A.pears
B.apples
C.bread
D.oranges

---Sorry, I had a stomachache. I had to stay in bed.

A. wrong B. absent C. patient

A. unless B. until

C. as soon as D. while

A. watch B. change C. control D. teach

A. sweater B. shoes C. bag D. sock

【题目】Teacher's Day is ________ the tenth ________ September every year.
A.on; in
B.at; in
C.in; on
D.on; at

---Well, be patient. _____ You can become better by reading more.

A. That’ s true. B. It takes time. C. I agree.