.He is said________a book on the history of Chinese tone bridge , but I don’t know if he has finished it.
A. to have written B. to be writing C . having writing D writing
The situation seems to be better, and I suppose it is because of the war ______ to an end.
| A．reaching | B．putting | C．coming | D．going |
The young man _______in studying paid no attention to the outside world.
| A．involved | B．involving | C．to be involved | D．being involved |
Every possible means _______to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
The doctor had almost lost hope at one point, but the patient finally______.
| A．pulled out | B．pulled through | C．pulled up | D．pulled over |
All the neighbors admire this family_______ the parents are treating their child like a friend.
| A．why | B．where | C．which | D．that |