Although the causes of cancer_____, we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering |
| C．are uncovering | D．have uncovered |
The chief editor demanded that the article immediately.
| A．submitted | B．was submitted | C．submits | D．be submitted |
The phone rang and I it .
| A．took; up | B．picked; up | C．speeded; up | D．swept; up |
— Ugh, what a mess! You need to clean the room right now, lazy bones!
— But the exam is approaching!
| A．constantly | B．mildly | C．thoroughly | D．previously |
Tom is good at his work, but he seems to _____ confidence.
| A．lack | B．lack of | C．lacking in | D．short of |
---Do you know Jim quarreled with his brother?
---I don’t know, _______.
| A．nor don’t I care | B．nor do I care | C．I don’t care neither | D．I don’t care also |