Rewrite the sentences:
1. I was very delighted that I passed the final exams.
 I was very delighted ____________________________________________.
2. Working in those conditions is impossible.
 It’s __________________________________________________________.
3. We find it difficult to understand this question.
 This question _________________________________________________.
4. Traveling around Viet Nam is very interesting.
 It’s __________________________________________________________.
5. She’s happy to get good marks this term.
 She’s ________________________________________________________.
6. My grandfather planted this tree.
 This tree _____________________________________________________.
7. My father takes me to school.
 I ____________________________________________________________.
8. They will repair their bicycles tomorrow afternoon.
 Their bicycles _________________________________________________.
9. They have built a new hospital near the airport.
 A new hospital ________________________________________________.
10. We can’t wear jeans at work.
 Jeans ________________________________________________________.

UNIT 10

EXERCISE :

A. Use the correct form of the word in parentheses( 5ms)

1. These products are ______________________ friendly. ( environment )

2. We want to share our recycling story with our _______________. ( read)

3. This is our new ____________________. Please try it . ( produce)

4. We are _______________that you are interested in protecting the environment.(delight)

5. Two __________________ from the group “ Friends of the Earth” are talking to the students. (represent )

B. Rewrite the sentences( 5ms)

6. They will open a new hotel next month.

→A new

7. Ba invited Liz to the rice- cooking festival.

→Liz _____________________________________________________________

8. They have postponed the concert.

→ The concert _____________________________________________________

9. They keep a lot of books in the school library.

→A lot of _________________________________________________________

10. They saw the clowns in the circus tent.

→ The clowns _____________________________________________________

Bài 1 : Cho tam giác ABC vuông tại A (AB < AC) có đường cao AH (H
thuộc BC)
a) Chứng minh:

HBA∽ ABC . Suy ra 2 BA BH.BC

b) Chứng minh:

2 HA HB.HC
c) Tia phân giác của ABC cắt AH tại D và cắt AC tại E.
Chứng minh:

BAE ∽BHD

. Suy ra DA.DB = DH. EB

Cho tam giác ABC có đường cao BE và CF

a) Chứng minh: Tam giác AEB đồng dạng với tam giác AFC

b) Chứng minh: Tam giác AEF đồng dạng với tam giác ABC

c) EF cắt đường thẳng BC tại K.Chứng minh: KF.KE=KB.KC

Cho tam giác ABC có đường cao BE và CF

a) Chứng minh: Tam giác AEB đồng dạng với tam giác AFC

b) Chứng minh: Tam giác AEF đồng dạng với tam giác ABC

c) EF cắt đường thẳng BC tại K.Chứng minh: KF.KE=KB.KC

d) Cho góc BAC= 60 độ.Tính S tam giác AEF/ S tam giác ABC

Bài 1: Cho tam giác ABC vuông tại A có AB = 12cm, BC = 20cm, đường
cao AH, BD là phân giác của góc ABC cắt AC tại D.
a) Tính AC.
b) Chứng minh ABC∽ HBA . Tính AH, HB, HC?

c) Tính AD, DC?