Instruction

Select the best answer to complete the sentence.

1. When you are tired, you are -------- to make careless mistakes.

2. All the managers of our company -------- to attend the annual conference at headquarters in July.

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

4. Due to the heavy snow storm, Flight 013 --------.

5. Because of roadwork, Mr. Cho's drive to the office may -------- longer than usual.

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