-- I’d like to invite you to a concert this evening.
-- Thank you, but _______ I’ll be free I’m not sure at the moment.
| A．while | B．if | C．whether | D．when |
At the railway station,the mother waved goodbye to her son until the train was .
| A．out of sight | B．out of reach |
| C．out of order | D．out of place |
Some teenagers hold the view that parents a full understanding of their children.
| A．are lacked in | B．lacking of |
| C．lack of | D．lack |
He kept his eyes and stayed where he was.
| A．shut | B．to be shut |
| C．shutting | D．to shut |
When copying the letter,pay special attention to not any words.
| A．leaving alone | B．leaving out |
| C．leaving behind | D．leaving aside |
The project by the end of 2033,will expand the city’s telephone network to cover 2 000 000 users.
| A．being accomplished |
| B．accomplished |
| C．to be accomplished |
| D．having been accomplished |