_____ many times, but he still doesn’t know how to operate the machine properly.
| A．Although I have shown him | B．I have shown him |
| C．Having been shown | D．Having shown |
At the meeting, the old man ______ some good advice about bringing down the market price of onion.
| A．came about | B．came along | C．came up with | D．came out |
The city ______ we visited last year is the one _____the famous writer was born.
| A．where, which | B．which, where | C．in which, that | D．where, where |
—Are they about to have dinner？
—Yes, it ________ in the dinning room.
| A．is serving | B．is served | C．is being served | D．serve |
We were swimming in the lake _____ suddenly the storm started.
| A．when | B．while | C．until | D．before |
---Have you read the timetable ? ---Yes . The train ____ at 10:12 p.m..
| A．will start | B．is going to start | C．should start | D．starts |