--Tom has been to Beijing before.
--________________.
| A．So does Jack | B．So has Jack |
| C．So is Jack | D．So he is |
The doctor has devoted most of his time to ___________ the patients.
| A．look after | B．looking after |
| C．looks after | D．looked after |
As a student, I can’t afford ___________ a new mobile phone.
| A．buy | B．buying | C．to buy | D．bought |
If we don’t study hard, we will___________ in our class.
| A．take the lead | B．fall behind |
| C．be the first | D．be successful |
— Did you enjoy the outdoor training yesterday?
— No, not at all! I was _____dead after so much hard training.
| A．as good as | B．as well as |
| C．so good as | D．so well as |
They thought ________ important to look left and right when ________ the road.
| A．it’s, cross | B．it, to cross |
| C．it, crossing | D．it was, to cross |