1. Bacteria of the harmful kind (cause) diseases.

→cause 

2.What we need most (be) books.

→ is

3.The English (be) proud and independent people.

→ are                       

4.The United States (have) a population of 250 million.

→ has ( hiện tại đơn)                                

5. There (be, not) any letters in the mail for you today.

→aren’t    ( hiện tại đơn)                    

6.Everyone in both cars (be) injured in the accident last night.

→ was    (quá khứ đơn)                                

7. The books borrowed from the library (be) on my desk.

→are  ( hiện tại đơn)                      

8. The boy who won the two medals (be) a friend of mine.

→is ( hiện tại đơn)  

9. Bread and butter (be) our daily food.

→is  (không đếm được, dùng số ít)                                                                                 

10. The quality of the candies (be) poor.

→is

11.Gold, as well as platinum, (have) recently risen in price.

→ has (hiện tại hoàn thành)

12. His courage and endurance (be) tried to the utmost.

→is 

13.No news (be) good news.

→ is     

14.A good man and useful citizen (have) passed away.

→ has (hiện tại hoàn thành)

15.The jury (be) divided in their opinions.

→ are (bị động)

16. The cost of all these articles (have) risen.

→has (hiện tại hoàn thành)

Xin hay nhất

1. Bacteria of the harmful kind (cause) diseases.

=> Bacteria of the harmful kind cause diseases.

2. What we need most (be) books.

=> What we need most is books.

3. The English (be) proud and independent people.

=> The English are proud and independent people.

4. The United States (have) a population of 250 million.

=> The United States has a population of 250 million.

5. There (be, not) any letters in the mail for you today.

=> There aren't any letters in the mail for you today.

6. Everyone in both cars (be) injured in the accident last night.

=> Everyone in both cars was injured in the accident last night.

7. The books borrowed from the library (be) on my desk.

=> The books borrowed from the library are on my desk.

8. The boy who won the two medals (be) a friend of mine.

=> The boy who won the two medals is a friend of mine.

9. Bread and butter (be) our daily food.

=> Bread and butter are our daily food.

10. The quality of the candies (be) poor.

=> The quality of the candies is poor.

11. Gold, as well as platinum, (have) recently risen in price.

=> Gold, as well as platinum, has recently risen in price.

12. His courage and endurance (be) tried to the utmost.

=> His courage and endurance are tried to the utmost.

13. No news (be) good news.

=> No news is good news.

14. A good man and useful citizen (have) passed away.

=> A good man and useful citizen has passed away.

15. The jury (be) divided in their opinions.

=> The jury are divided in their opinions.

16. The cost of all these articles (have) risen.

=> The cost of all these articles has risen.