Could you please tell me ____________ I can buy some stamps？
Yes． There is a post office on Center Street． （ ）
A．whyB．whereC．when
Wait politely，please.Don't on others.（ ）
A．cut inB．cut downC．cut outD．cut short
The Lianyungang﹣Xuzhou High﹣speed Railway was open to the public this year.（ ）
A．180 kilometer longB．180 kilometers long
C．180﹣kilometer﹣longD．180﹣kilometers﹣long
What an amazing robot!It cook more than 5，000 dishes.（ ）
A．shallB．needC．mustD．can
The Communist Party of China will have its 100th birthday July 1，2021.（ ）
A．inB．atC．onD．around
Jim，you'd better not too much time on your mobile phone.（ ）
A．costB．spendC．takeD．pay