---When did Kate’s grandma die?
---While the doctors______ on her.
| A．are operating | B．were operating | C．operate | D．operated |
On Sundays there were a lot of children playing in the park, _______ parents sitting together joking.
| A．their | B．whose | C．which | D．that |
--You do a very good job in German translation!
--Thanks. I ______ German in Zhejiang University for four years!
| A．was studying | B．study | C．studied | D．had studied |
More and more rich people have promised to ______ their wealth after death to help the poor and the disabled.
| A．give away | B．give up | C．give out | D．give off |
I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breathe |
| C．breathing | D．being breathed |
He came to my class every week, but his attitude ______ he was not really interested in the subject.
| A．expressed | B．described |
| C．explained | D．suggested |