—Why is he absent today?
—It is he is sick.
| A．since |
| B．as |
| C．for |
| D．because |
They asked questions before the new teacher started class.
| A．a series of |
| B．series of |
| C．the series of |
| D．series |
Why don’t you _____ your ideas on paper?
| A．set down |
| B．set up |
| C．set off |
| D．set out |
He has a difficult time recently.
| A．gone over |
| B．gone with |
| C．gone back |
| D．gone through |
I happened in the park a storm happened.
| A．to be; when |
| B．being; when |
| C．to be; while |
| D．being; while |