Instruction
Select the best answer to complete the sentence.
1. Water and air pollution is a big problem -------- all over the world.
2. Those services are available upon -------- for all of our customers.
3. You can’t get along here -------- you can speak some English.
4. Do you remember -------- to the circus when you were a child?
5. t is very important to ----------- the trend accurately.
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