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Choose the option in which the prepositions complete the verb phrases, respectively:

1. The problem stems __________ the government’s lack of action.

2. When I asked Jean, she hinted ________ the chance of a promotion for me.

3. The salesman was responsible ________ the accident.

4. Please, refrain _________smoking in the lecture lounge.

5. I can’t stand the way she is always boasting _______ her wealthy parents.