1. The streets of Manhattan are very ________（拥挤的）because so many people live there.
2. We don’t want to run the ________（风险）of losing their business.
3. An ________（外星人）got out from a UFO and walked down Centre Street.
4. I like living in the city though I know the ________（劣势）of living in the city.
5.（2023·苏州模拟）— How long does it take the Earth to c________ around the Sun once?
— About 365 days.
6. The p________ of the students who would like to move away from the Earth is 50％.
7.（2023·苏州模拟改编）— A survey about protecting the Earth was c________ out in our school last Friday.
— I hope more events like this will be held.
8. Many countries in the world have reached a ________ to reduce air pollution.

1. crowded 2. risk 3. alien
4. disadvantages 5. circle 6. percentage 7. carried 8. agreement

1. — We are worried about ____________ in such a noisy and polluted place.
— We’d better look for another hotel.
2. — Teenagers should be encouraged to leave home to explore and discover the world.
— Exactly. ____________, birds should fly freely in the sky.
3. — The number of wild animals is becoming smaller and smaller.
— To prevent people from ____________ wild animals, the government has taken action.
4. Our English class usually ____________ a free talk.
5. We had a ____________ with them about the differences between Britain and the USA.

1. living 2. After all 3. harming 4. starts with 5. discussion

Welcome to the Mars shuttle! You will find a few 1. ________（use）things in the bag under your seat. You can use them during your trip and on your 2. ________（arrive）. Please take out your bag now and become familiar 3. ________ the items in it.
Your air tank will allow you 4. ________（breathe）on Mars. Do you see the harness on the tank? You can use it to carry the tank on your back. The tube will carry air to your helmet. Inside the helmet, you can find a microphone. If you go out of your house on Mars 5. ________（careless）, you can use it to talk to your family members inside. And these 6. ________（specially）space boots will allow you to walk on Mars. You also have a pair of sunglasses for the trip. This will protect your eyes 7. ________ the strong sunlight. Use your space timer instead 8. ________ a normal watch if you don’t want to miss the shuttle back and get 9. ________（lose）in space. In the bag, there are some vitamin pills for you if you feel 10. ________（sickness）during the trip.
Lastly, remember to wear this temperature - control suit. It will help your body adjust to the temperature on Mars.

1. useful 2. arrival 3. with 4. to breathe 5. carelessly 6. special 7. from 8. of 9. lost 10. sick