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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