1. Chia thì

1.What is your daughter doing these days? She(study)........... English at the foreign language center.

2.We (have) .................... lunch at this time yesterday when he came.

2.Word form

1..................is a good career. I want to become a teacher.(teach)

2.He asked his teacher for............ to go home earlier.(permit)

3.HCM city is an important..................... center(commerce)

4.Sports are very good for our................(healthy)

5.Many elderly people are living in.................. now.(poor)

3.Viết lại câu sao cho có nghĩa giống nhau

1.Nobody has used the old house in the village for a long time.->The old house.............................

2.Although the traffic was heavy, he manged to get to the office in time.-> In spite of................................

3.A lot of people suffer from techno stress. Those people work in my office.->A lot of people..........................

4.They have planned to pay a visit to come caves near Huong Pagoda.->They are...............

5.Because she was absent from the school yesterday, she couldn't understand the lesson.->Because of............................

6.It was so dark that nothing could be seen.->It was too............................

7. After I had waited for my teacher for ten minutes, he arrived.->Before................................

1.He can speak English and French.(make question)->.....................................

2.He is the teacher. He teaches us English.(dùng đại từ quan hệ).->...................

3.They like to learn Chemistry and Biology(make question).->................................

4.I started working here last September.->.We have.......................................................

Word form

1.The journey to the countryside is very...............................(interest)

2. Lan has a very lovely ................ of the dolls. (collect)

use the following sets of words and phrases to write complete sentences.

1. The farmers/ work/ fields/ now.->....................................

2.My sister/ be/ interested/ study/ English.->...............................

3.They/ come/ when/ I/ play/ piano.->..................................

Nguyên tố X có NTK trung bình là 79,909 có hai đồng vị \(^{^A1}X\) và \(^{^A2}X\). Biết tổng số khối là 160. Số nguyên tử đồng vị \(^{^A1}X\)=1,2 lần số nguyên tử đồng vị \(^{^A2}X\). Xác định số khối của mỗi đồng vị

Nguyên tử Mg có 3 loại đồng vị có số khối lần lượt là 24,25,26. Trong số 5000 nguyên tử Mg thì có 3930 đồng vị \(^{24}Mg\), 505 đồng vị \(^{25}Mg\), còn lại là đông vị \(^{26}Mg\). Khối lượng nguyên tử trung bình của Mg là bao nhiêu?

Rewrite the following sentences as directed

1.The boy passed his friend's house every morning.->...........................................

2.He started working as an engineer 5 years ago.->....................................................

3. It is ages since he last came here.->.....................................

Sentence building

1.These farmers/ normally/ contened/ farm work.->.................

2.You/frequently/ send/ letters/ by e-mails?.->.................................

3.World War II/ begin/ 1939/ end/ 1945.->..............................................