We on the playground when it began to rain．（ ）
| A． |
ran |
B． |
were running |
| C． |
run |
D． |
have run |
Have you heard about Zhangjiajie Glass Footbridge？
Of course， it's built over a canyon in the Zhangjiajie National Forest Park．（ ）
A．300﹣meter﹣deepB．300﹣meters﹣deep
C．300 meter deepD．300﹣meters deep
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