Scientists hope to____soon in their fight against heart disease.
| A．break up | B．break out | C．break through | D．break in |
I am sure that you’ll love our best-seller, _____ you can read some good novels in simple English．
A which B．who C．that D．where
We all think that the plan you suggest _____ the work is very practical．
| A．completing | B．completed | C．to complete | D．should complete |
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 |
Not far from the club, there was a garden, _____ owner seated in it, playing chess with a friend．
| A．whose | B．its | C．his | D．which |
---Why didn’t you try your best to get on the bus?
---I tried to, but _____ I could, it started moving．
| A．until | B．when | C．before | D．after |