Spring is_____.

Sorry, we cannot _____ you the job because you don't have any workexperience.

I didn't answer the phone _____ I didn't hear it ring.

It suddenly occurred to me that we could ______ the police for help.

When dealing with a ______ task. Alice always asks for help from peoplearound her.

I _____ at 130 kilometers per hour when the police stopped me.

What are the essential differences _____ selling and marketing?

How much does it _____ to take the online training course?

Please call me back _____ you see this message.

I am sorry,but I have a question to _____ you.

宋代发明的插秧农具是( )

多数情况下,科学家是通过( )来判断一条鱼的年龄。

黄土高原古老的文明和独特的地理环境,形成了许多独特的民风民俗。下列民风民俗中均能体现“黄土风情”的一组是( )。①窑洞②信天游③泼水节④白羊肚头巾⑤藏袍

人骑自行车时,直接使车前进的力是( )。

下列现象中,利用了大气压的作用的是( )。