1. My dad was attacked by a ___ of bees last summer.
a. swarm
b. flock
c. school
2. I thanked him for the offer but ___ it down.
a. broke
b. cut
c. turned
3. Working out three times a week is ___ to our health.
a. convenient
b. dull
c. beneficial
4. How will these changes ___ our company?
a. effect
b. affect
c. face
5. In some countries, exhaust ___ cause over 80% of air pollution.
a. chemicals
b. fumes
c. fuels
6. Of course you can have a picnic here. Just don't leave any ___ behind.
a. litter
b. waste
c. measures
7. A: Oh, no. I made a mistake.
B: Don't worry. It's only ___ nature.
a. second
b. human
c. the forces of
8. Come on, Pete. Don't ___ up. We'll manage to finish the project.
a. use
b. end
c. give
9. The government has decided to ___ vehicles from the city centre. They want to encourage people to use public transport.
a. ban
b. wander
c. gather

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