Those were the graduate assistants ______ to do the research work in the lab.
| A．to whom it was their responsibility | B．whose responsibility there was |
| C．whose responsibility was | D．of whom with the responsibility |
---Not yet, I _______ it very carefully, but I haven’t decided.
| A．will consider | B．have been considering |
| C．had considered | D．was considering |
----Is she missing? I told you to take care of her.
| A．the; the | B．the; / | C．a; / | D．a; the |
--- Playing table tennis.
| A．killing time | B．to kill time |
| C．spending the time | D．to spend the time |
--- Yes. It is in the reading material ____ we ____ reading yesterday.
| A．that; did | B．that; were | C．when; were | D．when; did |
| A．is improving; taking | B．has been improved; being taken |
| C．improved; taken | D．is improving; have taken |