Âm thoa phát ra âm có tần số 450 Hz, đàn phát ra âm có tần số 200Hz. Dụng cụ nào phát ra âm cao hơn (bổng hơn)? Vì sao

11: Nêu đại diện của các ngành động vật sau(mỗi ngành 4 đại diện)

Ngành chân khớp

Ngành ruột khoang

Ngành giun đốt

Ngành thân mềm

Ngành giun dẹp:

Complete the sentences with correct forms or tenses of verbs.

1.      He (visit) ___________ his parents next week.

2.      Hoa (play) _____________ the piano now.

3.      Phong (watch) _________ television every night.

4.      They (go) ___________ to the movies tonight.

5.      Ba can (fix) __________ the lights.

6.      They (do) _____ some experiments at the moment.

7.      Mai (learn) ____ to play the piano in her free time.

8.      I (try) ___________ to repair the radio now.

9.      The students (write) _____________ an essay in Literature next Monday.

10.  I never (come) ______________ to school late.

Put the words in the correct order to make meaningful sentences

1.  watches/ television/ every evening/ My father.

à………………………………………

2. is/ your bike/ more expensive / than/  My bike .

à…………………………………………

3. your house/ is it  /from / the post office / How far /?

à…………………………………………..

4. different activities / after school/ The students /take part in .

à………………………………………….

Change into Exclamatory sentence.

1. The boy is very intelligent.=> What_____________________________________!

2. The garden is lovely. => What _________________________________________!

3. The children are very naughty. => What _________________________________!

4. They are delicious cakes. => What ______________________________________!

5. It is an expensive dress. => What _______________________________________!

Complete the sentences with correct forms or tenses of verbs.

      1.      Listen! He (cry) _________ .

      2.      He (visit) ___________ his parents next week.

      3.      Hoa (play) _____________ the piano now.

     4.      Phong (watch) _________ television every night.

     5.      They (go) ___________ to the movies tonight.

     6.      Let’s (go) _________ to the English club.

     7.      They (do) _____ some experiments at the moment.

     8.      You (be) ____________ a famous author one day.

     9.      He often (go) ______ to English club after school.

     10.  All the students enjoy (camp) ____________ on the weekend.

2. about 12 hours/ every week/ She has/ of homework/. --> She has _______________________________________ *

1. Hoa _____________ and see Mom and Dad tomorrow. (go) *

5. We will have a vacation that last for three months.

We will have a

6. Nam will visit his grandparents tonight.

Nam is