1. Maurice could hear voices in the kitchen below, but he couldn’t _______ what was being said.

A. bring out        B. take out         C. make sure        D. make out

2. The boy asked me so many strange questions that they really _______ me a lot.

A. indicated        B. confused         C. identified       D. criticized

3. Regulations _____ that students attend at least 90% of the lectures.

A. demand           B. ask              C. require          D. request