compare
| A．company | B．continue | C．common | D．concert |
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 |
Jack went to college last year, _________ to return home until he achieves his goal.
| A．determining not | B．not determined | C．not determining | D．determined not |
— What’s that terrible noise?
— The boys _________ for a party.
| A．are preparing | B．have prepared | C．prepare | D．will prepare |