It is summer now in China ________it is winter in Australia．

A．before

B．until

C．while

D．since

It's safe to walk on the ________ to get to the other side of the street．

A．crossroads

B．traffic lights

C．entrance

D．zebra crossing

People call Zhalong Birds' Home．The sentence structure of it is ________．

A．S＋V

B．S＋V＋P

C．S＋V＋IO＋DO

D．S＋V＋DO＋OC

Just like weather, life ________ be beautiful all the time．

A．mustn't

B．needn't

C．can't

D．wouldn't

I haven't had enough ________recently, so I'm always ________all day．

A．sleep, sleeping

B．asleep, sleepy

C．sleepy, sleep

D．sleep, sleepy

Few students can understand the sentence until it ________twice or three times．

A．explains

B．is explained

C．will be explained

D．has explained

The camera ________me 1200 yuan．But I don't think it's ________so much．

A．cost, worth

B．paid, cost

C．too, worth

D．spent, cost

________ the people lost their lives in the traffic accident．

A．Three hundred

B．Three hundred of

C．Three hundreds of

D．Hundred of

The old radio requires ________, so you'd better have it ________ soon．

A．to repair, repaired

B．repairing, repaired

C．repaired, repair

D．to repairing, repair

Would you mind me ________ here?________．Let me take my bag away．

A．to sit, Better not

B．sitting, Better not

C．to sit, Not at all

D．sitting , Not at all