We ___________ try our best to fight against pollution.（ ）
| A． |
should |
B． |
may |
C． |
mustn't |
D． |
needn't |
How amazing this robot is!
Wow， it has video cameras in its eyes， so it "see" and interact with people．（ ）
A．mayB．canC．mustD．should
I'm sorry I took your school uniform by mistake． But where is ？
Don't worry． Let me help you find it．（ ）
A．heB．hisC．mineD．yours
Zanco， American tech company， made tiniest phone in the world﹣the Tiny 11．（ ）
A．the； aB．an； /C．/； aD．an； the
He explained again and again in order to make what he did ．（ ）
A．understandB．understood
C．to understandD．understanding
Could you tell me how to pay for the food by QR code（二维码）on the phone？
．（ ）
A．Take it easyB．It doesn't matter
C．You're welcomeD．Sure． I'd love to