What are they talking about？
They are talking about the greatest inventions _____ have made a big difference to our daily life．（ ）
| A． |
which |
B． |
who |
C． |
that |
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
Miss Li，a humorous teacher，taught maths last term.（ ）
A．usB．ourC．oursD．ourselves
Which underlined letter pronounces differently from the others？（ ）
A．dogB．polluteC．knockD．strong