9.  What is your ______________subject at school?

10.  Do you know any other books ______________ Nguyễn Nhật Ánh?

11.  In a ______________ class, you study about living things like plants and animals.

12.    Nguyễn Nhật Ánh is the ______________ of several story books for teenagers .

13.    This is a ______________ between you and me. Don’t tell anyone about it.

14.              I don’t like watching horror movies. They’re  ______________.

15.              Before I buy a new book, I often read ______________ about it on the Internet.

16.  Harry Potter is a series of seven ______________ novels by J. K. Rowling, a British author.

17. I want to sign up ______________ the Music Club this year.

18.    I ______________ playing badminton in my free time.

19.              Can I borrow your eraser? I can’t find  ______________.

20.              You can join one of the three sports clubs this year: badminton, basketball, _________ table-tennis.

21.              Our school has three sports clubs this year: swimming, volleyball, ______________ soccer.

1. What _____ ( do ) you do yesterday morning?

2. There _____ ( be ) 13 candies on the table

3. Anna _____ ( chat ) with her friend at the moment

4. She ______ ( not go ) to school on Sunday

5. If he _______ ( study ) hard, he _____ ( get ) good mark

6. My school _______ ( build ) in 1993

7. They are _____ ( go ) to China this summer vacation

8. Which country is ______ ( big ) , Russia or USA

9. Listen! The bird ______ ( sing )

10. Be quiet! The baby ______ ( sleep )

Ai đúng thì mình sẽ tick

Why do scientists use control groups?

Select one:

b. To test many variables

c. To speed up experiments

d. To reduce costs