Only when _______ home_____ that he had left his bag in the taxi he had taken.
| A．he returned; did he realize | B．did he return; did he realize |
| C．he returned; he realized | D．did he return; he realized |
Sometimes, ________ we show our gratitude for a person is reflected in the kind of food we serve him or her.
| A．when | B．whether |
| C．why | D．how |
—I wonder ________ so many people are crazy about Gangnam Style.
—It's good for bodybuilding, and it brings people a lot of fun, you know.
| A．how | B．where |
| C．why | D．that |
It seemed to me that she was in doubt ________ Timmy lived or died.
| A．why | B．how |
| C．that | D．whether |
—________ you write so well?
—By reading and keeping diaries every day.
| A．How is it that | B．Is it how that |
| C．How it is that | D．What is it that |
It is a teacher's responsibility always to hope, ________ with learning, a boy's character might be changed.
| A．when | B．what |
| C．that | D．which |