----Did you see a child dressed in red pass by?
----Sorry, I _____ the poster on the board without noticing anyone.
| A．have read | B．had read | C．am reading | D．was reading |
—What time do we have to be at the gate?
—_______ passengers start to board the plane.
| A．Hurriedly |
| B．Soon |
| C．Immediately |
| D．Since |
Simon thought his computer was broken _______ his little brother pointed out that he had forgotten to turn it on.
| A．until | B．since |
| C．after | D．because |
Don’t be afraid of asking for help _______ it is needed.
| A．unless |
| B．since |
| C．although |
| D．when |
Food shortage will long be a worldwide problem _______ much has been done to supply enough for everyone.
| A．before | B．if |
| C．since | D．although |
I do every single bit of housework _______ my husband Bob just does the dishes now and then.
| A．since | B．while | C．when | D．as |