Our teacher often asks us _____ about questions in groups.

—Why did you plant so many trees? — ______ the environment.

She always watches her son ________ the road every morning, or she will feel worried.

We know that she enjoys ______ books very much.

— What about playing football this afternoon, Sam?— I would rather　　　 　 at home than　　　 football. It’s too hot outside.