We considered him to be a true friend, ______did many others whom he had cheated
| A．which | B．as | C．when | D．though |
. _________ is known to all, good friends _________ happiness and value to life.
| A．It; add | B．As; add | C．It; add to | D．As; add to |
At the sight of the _________ scene, he was almost _________ to death.
| A．frightening；frightened | B．frightened；frightened |
| C．frightening；frightening | D．frightened；frightening |
The scientist knew nothing about the matter, because he was always _________ himself in his study.
| A．burying | B．devoting | C．focusing | D．concentrating |
He said he _________ his work, and then we needed to wait for him for a little while.
| A．just finished | B．was just finishing | C．had just finished | D．was just finished |
How pleasant the picture is to _________!
| A．be looked at | B．being looked at | C．looking at | D．look at |