The old couple have been married for 40 years and never once _______ with each other.
| A．they had quarreled | B．they have quarreled |
| C．have they quarreled | D．had they quarreled |
—About income,Ithinkmost people deserve more than what they get.
— ______.
| A．It serves you right | B．You have a point |
| C．Not likely | D．Don’t mention it |
Most scientists seem to agree that ____certain limit should be set on ______consumption of cars to ease air pollution.
| A．a；the | B．/；the | C．the；/ | D．the；the |
They are determined to go into the dark cave, ______ my warning of danger.
| A．regardless of | B．because of | C．apart from | D．instead of |
一"Peter, have you got your new flat furnished?
—Yes. I ______ some used furniture and it was a real bargain.
| A．will buy | B．have bought | C．bought | D．had bought |
These diagrams are especially helpful when we have a concrete problem ______ at hand.
| A．be solved | B．to solve | C．solved | D．being solved |