There is a new problem involved in the popularity of private cars __________ road conditions need __________.
| A．that; to be improved | B．which ； to be improved |
| C．where ； improving | D．when ； improving |
Life is like a long race ____ we compete with others to go beyond ourselves．
| A．which | B．what | C．that | D．where |
Since when has ____ been any of your business what I do?
| A．it | B．that | C．all | D．this |
We walked as fast as we could,____ to catch the 9:30 train．
| A．to hope | B．hoping | C．hoped | D．hope |
—See the gathering clouds outside? Please take this umbrella with you．
— .
| A．Thanks．Take it easy | B．OK, just in case |
| C．Well, it just depends | D．All right．I'll try my luck |
Scientists hope to____soon in their fight against heart disease.
| A．break up | B．break out | C．break through | D．break in |