题目列表(包括答案和解析)
27.She must type the letters this afternoon.
26.You can use a dictionary in the exam.
25. We must water the trees as often as possible.
24.You must correct your mistakes in your exercises.
23.Students must clean their classroom every day.
22. ----- Why should trees _______ (plant) on the mountains?
----Forests are very important to the world. The wind can ______ (stop )from _____ (blow) the earth away. The sand can ______ (stop ) from______ (move) towards the rich farmland.
-----We ______ already_________ (plant) about eight thousand trees. Millions of trees may _______ (need) for all the mountains here, you’ll ______ (see) a “Great Green Wall” in a few years’ time.
----That’ll be really wonderful.
21. ----Do you know how to grow cotton?
----Yes, more or less.
----Can cotton _______ (grow) in water?
-----No, It’s usually _________ (grow) on the ground.
----- Can cotton _______ (harvest) once a year?
----Yes, It can’t _______ (harvest) twice a year.
20.I _____ (see)your uncle when I _____ (walk)in the street yesterday
19.The scientists said the world's population _____ (slow)down in a few years' time.
18._____ (have)confidence is very important
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