一 “What subject do you like best?”句型的用法
（）1. — What do you like best? — I like PE. It's interesting.
A. colour B. time C. subject
（）2. 你想知道朋友最喜欢什么学科,可以问：
A. What subjects do you like? B. What subject do you like best?
C. What subjects do you have?
（）3. 你想告诉朋友你最喜欢英语,可以说：
A. I like English best. B. I like English. C. I also like English.
4. — — I like Science best.
5. My favourite subject is Chinese.（改为同义句）

1. C 2. B 3. A 4. What subject do you like best? 5. I like Chinese best.

二 "Welcome back（to）..."句型的用法
（）1. Welcome back school, boys and girls!
A. at
B. to
C. /
（）2. 开学第一天，老师会说：
A. Welcome back to school, class.
B. Welcome to the farm.
C. Welcome to the zoo.
（）3. 当你的好朋友从外地旅行回来时，你会对他说：
A. Welcome to my home.
B. Welcome back!
C. Enjoy your trip!
（）4. 爸爸下班回家，你会说：
A. Welcome to my home.
B. Welcome back home.
C. Goodbye, Dad!
5. — I'm back, Mum! —

1. B 2. A 3. B 4. B 5. Welcome back, my dear! /Welcome back home!（答案不唯一）

三 "Let's ..."的用法
() 1. Let's to the park together.

A.go
B.goes
C.going

1. A

2. — It's time for PE. — Great!

2. Let's go to the sports ground!（答案不唯一）