一、根据句意及中、英文提示完成单词。
1. This kind of bike is easy to ride, but there's a (劣势).
2. What's the (百分率) of people dying of this disease every year?
3. Some people believe that (外星人) have visited the Earth.
4. They are making a (调查) of the pressure of students.
5. There are not enough people willing to take the (the possibility of something bad happening).

一、1. disadvantage 2. percentage 3. aliens 4. survey 5. risk

二、用方框中所给单词的适当形式填空。

1. Our are so small that they can't carry lots of people to Mars.
2. We think our Earth will be more in the future.
3. We all know there are lots of of living on Mars, so we won't move out of the Earth to Mars.
4. Without air or water, can't survive.
5. Polluted air does to our health. It's necessary to keep air fresh and clean.

二、1. spacecraft 2. crowded 3. disadvantages 4. humans 5. harm

三、用括号中所给动词或短语的适当形式填空。
1. There will be little space for people (stand) in the future, will there?
2. Reading in the sun (do) harm to your eyes.
3. Eddie always worries about (not have) food to eat.
4. It's hard to imagine (live) in a place where there are no cars.
5. —Did you go to the farm to visit your grandparents yesterday?
—No, we didn't. It (put) off because of an unexpected guest.

三、1. to stand 2. does 3. not having 4. living 5. was put

四、单项选择。
()1.Sixty per cent of the teachers now living around the school.

A.is
B.are
C.has
D.have

四、1. B 【点拨】“百分数+of+名词”作主语时，谓语动词的形式要与名词的数保持一致；又由 now 可知，用 are。故选 B。

()2.(2023·四川遂宁)Miss Xiang is a great teacher always makes her classes lively and fascinating.

A.which
B.who
C.what
D.whom

2. B

()3.The birthday party of last night the song *Happy Birthday to You*.

A.starts in
B.started with
C.started in
D.starts with

3. B 【点拨】start with 表示“以……开始”，由 last night 可知，句子用一般过去时。故选 B。