______you may have，you should gather your courage to face the challenge.
| A．However a serious problem |
| B．What a serious problem |
| C．However serious a problem |
| D．What serious a problem |
---- Mary, you water the plants in the garden and I will cook the dinner.
----_____
| A．Why me? | B．Forget it. |
| C．That’s all right. | D．OK, that’s settled. |
_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
_____ all over the hills and around the lake are wild flowers of different colors.
| A．Grow | B．To grow | C．Growing | D．Grown |
Doctor, I’m a lady of 48 _____ 84 kg. Can I lose weight by breathing exercise?
| A．weighs | B．weighed | C．being weighed | D．weighing |
When travelling in buses or trains,we are likely to have conversations _____ we give information or opinions about different things.
| A．where | B．which | C．what | D．when |