Instruction

Select the best answer to complete the sentence.

1. Bill -------- his mother for four years when she died of a lung cancer at the age of 65.

2. Water and air pollution is a big problem -------- all over the world.

3. Mr. Martin is -------- to regain the CEO’s job after returning to the headquarters.

4. -------- with similar models, this car has the best fuel efficiency.

5. Any visitors to our company must sign in at -------- the guard office or the entrance of the building.

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