The 2022 Winter Olympic Games will be held ______________Beijing, China. It will be another big event for us Chinese people.

A.in B.at C.on

It's dangerous to play your cellphone while walking in the street because you ______________be knocked by a car.

A.must B.should C.may

When Mr. Li came in and saw the clean and tidy classroom, he was very satisfied and praised the students who were______________.

A.on time B.on business C.on duty

Linda is interested in ancient buildings, ______________when she saw the Fujian earth building（福建土樓）, she jumped with excitement.

A.or B.but C.so

—The accident taught me a ______________that I will never forget.

—I think we should always put safety in the first place.

A.lesson B.method C.skill

Listen! Tom ______________in the classroom. How beautiful his voice is!

A.has sung B.will sing C.is singing

—In fact, WeChat has become a necessary part of our daily life since it______________.

—I can't agree with you more.

A.is invented B.was invented C.has invented

The volunteers wanted to set up a library for the village. They ______________a lot of difficulties and finally realized their dream.

A.got into B.got away C.got over

—______________rapidly Fujian Province is developing!

—Yes, you are right. There are many high—speed railways being built.

A.How B.What C.What a

—Language learning isn't difficult itself. The attitude ______________you have decides whether you can learn it well or not.

—You' re right.

A.what B.that C.who