Đáp án : 

13. Trung will mail his letter to Bruce, his pen pal.

>> who will Trung mail his letter to?

14. The stamps for your letter cost 8,000 VND.

>> How much do the stamps for your letter cost?

15. Minh needs a phone card because she wants to give he parents a call.

>> why does Minh need a phone card?

16. There are over 1.000 stamps in Nam's collection.

>> How many stamps are there in Nam's collection.?

17. I'd like to buy some local goods.

>> What would you like to buy?

18. Tam phones his uncle twice a month.

>> How often does Tam phone his uncle?

19, Our class starts at seven thirty. 

>> When does your class start?

20 , It takes me two hours to do my homework

>> I spend two hours each day doing my homework?

21, The farmers work very hard.

>> How do farmers work?

22, The summer vacation lasts for almost three months.

>> How long does summer vacation lasts?

23, >> What will you do during the vacation?

24, >> How many hours do Vietnamese students work a week?

25, >> Why is she definitely not lazy ?

13.  Trung wil mail his letter to Bruce, his pen pal

      ⇒ who will Trung mail his letter to?

14. The stamps for your letter cost 8,000 VND.

      ⇒ How much do thestamps for your letter cost?

15. Minh needs a phone card because she wants to give he parents a call.

      ⇒ why does Minh need a phone card?

16. There are over 1.000 stamps in Nam's collection.

      ⇒ How many stamps are there in Nam's collection.?

17. I'd like to buy some local goods.

     ⇒ What would you like to buy?

18. Tam phones his uncletwice a month.

     ⇒  How often does Tamphone his uncle?

19, Our class starts at seven thirty. 

      ⇒When does your class start?

20 , It takes me two hours to do my homework

      ⇒ I spend two hours each day doing my homework?

21, The farmers work very hard.

     ⇒ How do farmers work?

22, The summer vacation lasts for almost three months.

      ⇒ How long does the summer vacation last?

23., We will visit out grandmother during the vacation.

      ⇒ What will you do during the vacation?

24, Vietnamese students work 25 hours a week.

      ⇒ How many hours do Vietnamese students work a week?

25, She is definitely not lazy because she works 45 hours a week.

      ⇒ Why is she definitely not lazy ?

26, Hong’s mother worked at a supermarket

      ⇒ Where is Hong's mother work?

27, My father gets about seven public holidays every year.

      ⇒ What does your father get each year?

28, They always went to Ha Long Bay on vacation.

      ⇒ How often do they go to Ha Long Bay on vacation.

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