一、根据句意和首字母提示，补全单词。
1. More than 70% of the earth's surface(表面) is covered with water,so it is called a blue p.
2. No m how many difficulties we meet,we will never give up.
3. It's polite of you to k on the door before you enter(进入) someone's room.
4. We can only use about 1% of the water on the earth, so we should save every drop of water in our
d life.
5. Don't put your books e. Put them in your schoolbag after you finish your homework.
6. The little boy can c from one to ten.
7. If the temperature d below zero degree,water will turn into ice.
8. Nowadays it's very easy for us to get i on the Internet.
9. Please close the d. There is a strong wind outside.
10. Zhou Ting always goes shopping with a shopping basket. She never uses p bags.

1. planet
2. matter
3. knock
4. daily
5. everywhere
6. count
7. drops
8. information
9. door
10. plastic

1. 根据句意及首字母提示，地球被称为蓝色星球，应填planet（星球）。
2. “No matter how many”是固定搭配，意为“不管多少”，结合首字母m，填matter。
3. “knock on the door”是固定短语，意为“敲门”，符合进入房间前敲门的语境，结合首字母k，填knock。
4. “daily life”是固定短语，意为“日常生活”，符合节约日常用水的语境，结合首字母d，填daily。
5. 根据句意不要把书乱放，结合首字母e，填everywhere（到处）。
6. 根据句意小男孩能从1数到10，结合首字母c，填count（数）。
7. 温度下降用drop，主语temperature是第三人称单数，结合首字母d，填drops。
8. 在网上获取信息，information是不可数名词，结合首字母i，填information。
9. 外面大风要关门，结合首字母d，填door（门）。
10. “plastic bags”意为“塑料袋”，符合语境，结合首字母p，填plastic。

二、从方框中选择适当的单词并用其正确形式填空，每词限用一次。
dig enough reuse through tap once deep introduce collect still
1. The sunlight comes into the room the window.
2. Take it easy. You can take a breath and smile.
3. Remember to turn off the when you are not using it.
4. Don't worry. We have time to take the subway to the airport.
5. I want to some rock samples(岩石样本)on the way to the top of the mountain.
6. Most people in the desert have to spend a lot of money wells to get water from the underground.
7. —How often do you go to the library?
— a week.
8. I remember five years ago when I first came to this school.
9. After we wash our clothes,we can the water to clean the floor.
10. —Nice to meet you. Let me myself first. I'm John.
—Nice to meet you,too. I'm Sally.

1. through
2. deep
3. tap
4. enough
5. collect
6. digging
7. Once
8. still
9. reuse
10. introduce

1. 句意：阳光透过窗户照进房间。through表示“从（内部）穿过”，符合语境。
2. 固定短语take a deep breath意为“深呼吸”，故填deep。
3. 句意：不用的时候记得关掉水龙头。tap意为“水龙头”，符合语境。
4. 句意：别担心，我们有足够的时间坐地铁去机场。enough表示“足够的”，修饰名词time，符合语境。
5. 句意：我想在去山顶的路上收集一些岩石样本。collect意为“收集”，want to后接动词原形，故填collect。
6. 固定搭配spend money doing sth.意为“花钱做某事”，dig的动名词形式是digging，此处表示挖井，符合语境。
7. 问句询问频率，once a week是固定表达，意为“一周一次”，故填Once。
8. 句意：我仍然记得五年前我第一次来这所学校的时候。still意为“仍然”，符合语境。
9. 句意：我们洗完衣服后，可以再利用水来擦地板。reuse意为“再利用”，情态动词can后接动词原形，故填reuse。
10. 固定搭配introduce oneself意为“自我介绍”，let后接动词原形，故填introduce。

三、用括号内所给单词的正确形式填空。
1. The moon is about 384,000 (kilometre) away from the earth.
2. What fine weather! We'd better not stay at home. Let's go (cycle).
3. The young man wants to be a soldier(士兵) and (protect) our country.
4. We'd better go to the dentist to check our (tooth) every six months.
5. I think computers are very (use). They help us a lot in everyday life.
6. Come on! There are only a few (step) to the top.
7. Water (cover) more than 70% of the earth's surface,but most of that is sea water.
8. —Could you give me some (suggestion) on how to keep healthy?
—Swimming is a very good way. You can try it.
9. We are surprised that ninety (percent) of the students use the Internet every day.
10. These (fact)show that exercising every day is good for our health.
词组挑战

1. kilometres；2. cycling；3. protect；4. teeth；5. useful；6. steps；7. covers；8. suggestions；9. percent；10. facts

1. 前面的数字384,000是大于1的数，可数名词kilometre需用复数形式；2. go+动名词是固定用法，表示进行某项活动，go cycling是固定搭配，意为“去骑自行车”；3. and连接并列成分，此处与be a soldier并列，都在want to之后，所以用动词原形protect；4. our表示“我们的”，牙齿是复数概念，tooth的复数形式为teeth；5. 此处需形容词作表语，use的形容词形式是useful，意为“有用的”；6. a few后接可数名词复数，step的复数形式是steps；7. water是不可数名词，作主语时谓语动词用第三人称单数形式，cover的第三人称单数是covers；8. some后接可数名词复数或不可数名词，suggestion是可数名词，故用复数形式suggestions；9. percent单复数形式相同，此处表示“百分之九十”，用percent即可；10. these表示“这些”，后接可数名词复数，fact的复数形式是facts。