Taobao is Asia’s largest retail（零售的） network platform, ______ people can buy and sell many kinds of things．
| A．when | B．whose | C．that | D．where |
David rode so fast that he couldn’t hitting a passer-by and he fell off the bike.
| A．avoid | B．enjoy | C．stand | D．stop |
I’d appreciate if you could turn the radio down. I’m doing my homework.
| A．you | B．that | C．this | D．it |
— If it tomorrow, we’ll stay at home.
— It would be boring.
| A．rain | B．rains | C．will rain | D．is raining |
It is bad for a man to smoke in public places where smoking is not allowed.
| A．method | B．impression | C．behavior | D．attitude |
At last the mother had no choice but ___________ her son herself, though she was quite busy．
| A．to pick up | B．pick up | C．picking up | D．picked up |