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. My sister can walk -------- the station by herself.

3. -------- regard to the new company policy, please refer to the file attached to this email.

4. Ms.Brown was promoted to senior vice president ------- working for her previous employer.

5. America’s trade with South Africa ------- equals that with all the other sub-Saharan African nations in terms of value.

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