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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