---- You should be _______ careful when you take the chemistry exam.
---- I agree. In this way, I will make _______ mistakes.
| A.more; less | B.more; more |
| C.more; fewer | D.less; fewer |
— _____ you stay in America every summer?
—For two months.
| A.How many | B.How often |
| C.How long | D.How |
Mary isgirl, but she knows a lot about science.
| A.a eight-year-old | B.eight-year-old |
| C.eight years old | D.an eight-year-old |
Find the answer _____ the question, please.
| A.of | B.with | C.to | D.for |
It is a good time _____.
| A.sing | B.to sing | C.singing | D.sang |
They each _____ a CD in their bags.
| A.have | B.has | C.is | D.are |