(二)用所给词的适当形式填空。
1. The knife is used for ______(cut) paper.
2. As a student, you should learn how to use a dictionary ______(look) up new words.
3. The book is of great ______(use) to students.
1. The knife is used for ______(cut) paper.
2. As a student, you should learn how to use a dictionary ______(look) up new words.
3. The book is of great ______(use) to students.
答案
1. cutting 2. to look 3. use
[典例剖析]单项选择。
( )There isn't much clean water on Earth. We should ______ it wisely.
A.used
B.useful
C.use
( )There isn't much clean water on Earth. We should ______ it wisely.
A.used
B.useful
C.use
答案
【解析】：本题考查的是情态动词后接动词原形的规则。在英语中，情态动词如should，must，can等后面需要接动词的原形。选项A是动词的过去式，选项B是形容词，选项C是动词的原形。根据题目中的“We should ______ it wisely.”可知，应该使用动词的原形，因此选项C是正确的。
【答案】：C
【答案】：C
[反馈练习](一)按要求完成句子。
1. They should colour the Earth in the picture. (改为否定句)
They ______ ______ the Earth in the picture.
2. She should arrive there before noon. (改为一般疑问句)
______ ______ ______ there before noon?
3. We should use glass bottles in our daily life. (对画线部分提问)
______ ______ you ______ in your daily life?
1. They should colour the Earth in the picture. (改为否定句)
They ______ ______ the Earth in the picture.
2. She should arrive there before noon. (改为一般疑问句)
______ ______ ______ there before noon?
3. We should use glass bottles in our daily life. (对画线部分提问)
______ ______ you ______ in your daily life?
答案
1. shouldn't colour 2. Should she arrive 3. What should, do
