Some students found _____ hard to study English well .
| A．this | B．it | C．that | D．which |
These are all ________houses for the homeless.
| A．newly - building | B．newly-builder |
| C．new - building | D．newly - built |
— Were you worried about him last night?
— Yes. It was ________.
| A．until he returned that I went to bed |
| B．until be returned that l slept well |
| C．not until he returned that I went to bed |
| D．not until did he return that I went to sleep |
Now that he has missed his ________, he’ll have to wait for the next round.
| A．chance | B．turn | C．duty | D．class |
We’ve always known him ________ a warm but calm character.
| A．for | B．against | C．on | D．as |
The step you have taken is ________ much risk（冒险）.
| A．one of | B．the one of | C．the one | D．that one |