---Hello, I ________ you were in Chongqing. How long have you been here?
---Just a few days.
| A．don’t know | B．didn’t know |
| C．wouldn’t know | D．haven’t known |
You have made a mistake --- you have _______ the letter “e”.
| A．left aside | B．left alone | C．left out | D．left behind |
News reports say peace talks between the two countries have broken down ______ no agreement reached.
| A．with | B．as | C．because | D．like |
—Why didn’t you try your best to get on the bus?
—I tried to , but _______ I could, it started moving.
| A．before | B．when | C．until | D．after |
They were walking along the shore _______ a huge wave appeared out of nowhere, sweeping them out to sea.
| A．as | B．while | C．when | D．though |
_______, and the problem will be straightened out.
| A．There being a little effort | B．Having a little effort |
| C．If you have a bit more effort | D．A bit more effort |