The shopping mall is making every effort to ________ new customers in order to sell more foods

I ______ ride a bike to school. But this morning I took a taxi because I got up late.

“It’s raining too heavily at this moment,” said the old woman, ________ out of the window.

When did you become a volunteer for the elderly——Two years ago. I ______ this group since then.

对下列文学常识的解说，不恰当的一项是