) 1. —What are you going to do next weekend? —I ______ yet. Do you have any good ideas? A. haven't decided B. won't decide C. have decided D. didn't decide
答案：1. A 解析：yet用于現(xiàn)在完成時(shí)否定句，“我還沒決定”，用haven't decided。
(
A
) 2. In our class ______ of the students ______ girls. A. three fifths; are B. three fifths; is C. third five; are D. third fifths; is
答案：2. A 解析：分?jǐn)?shù)表達(dá)法：分子用基數(shù)詞，分母用序數(shù)詞，分子大于1分母加s；three fifths 五分之三，主語students是復(fù)數(shù)，謂語用are。
(
C
) 3. —Drinking too much is much ______ our health. —Yes. It may also cause a bad traffic accident if we drive after drinking. A. be harmful to B. are harmful to C. does harm to D. do harm to
答案：3. C 解析：do harm to 對……有害，動(dòng)名詞Drinking作主語，謂語用第三人稱單數(shù)does。
(
D
) 4. Helen didn't work hard as usual. ______, she failed her final exam. A. In fact B. After all C. When D. As a result
答案：4. D 解析：As a result 結(jié)果，“海倫沒像往常一樣努力學(xué)習(xí)，結(jié)果期末考試不及格”。
(
C
) 5. —Trees can stop the sand ______ towards the rich farmland in the south. —I agree, so let's plant more trees every year. A. to move B. move C. from moving D. moves
答案：5. C 解析：stop sb./sth. from doing sth. 阻止……做某事，“樹能阻止沙子向南方肥沃農(nóng)田移動(dòng)”。
(
B
) 6. If you are traveling to Beijing, I will give you a map of Beijing ______ you will not get lost. A. because B. so C. and D. on
答案：6. B 解析：so 因此，“我會(huì)給你北京地圖，因此你不會(huì)迷路”。
(
A
) 7. Don't forget to ______ the electricity when you leave your house for a long journey. A. shut off B. turn down C. shut on D. turn on
答案：7. A 解析：shut off the electricity 切斷電源，固定搭配；turn down 調(diào)?。籺urn on 打開。
(
C
) 8. I ______ here last year, so I ______ here for a year. A. came; came B. came; have come C. came; have been D. have come; have been
答案：8. C 解析：last year 用一般過去時(shí)came；for a year 用現(xiàn)在完成時(shí)have been（be here表狀態(tài)可延續(xù)）。
