Tam giác ABC có góc A=90° AB=21cm;Góc C=40° Tính AC; BC, phân giác BD (kèm hình vẽ)

Use a relative pronoun or relative adverb to combine each pair of sentences below

1) I looked at the moon. It was very bright that evening

2) my father goes swimming everyday . You met him this morning

3) That car belongs to Dr Clark. It's engine is very good

4) In the class there are 48 students. The teacher knows only a few of them

5) The pupils haven't done their homework. It is too bad

6) We first met in 1945. The revolution took place then

7)the girl is happy. She won the race

8) the taxi driver is friendly. He took me to the airport

9)I liked the composition. You wrote it

10)the people we're very nice. We visited them yesterday

11)the meeting was interesting. I went to it

12)the picture was beautiful. She was looking at it

13)I apologized the woman. I spilled her coffee

14)the professor is excellent. I'm taking her course

15) the man called the police. His wallet was stolen

Use a relative pronoun or relative adverb to combine each pair or sentences below

1: tom has three sister. All of them are married

2: i recently went back to Paris. It isvstill as beatiful as a peal

3: i recently went back to Paris. I was born in Paris nealy 50 years ago

4: she is the most intelligent woman. I have ever met this woman

5: This doctor is famous. You visited him yesterday

6: Do you know the music? It is being phayed on the radio

7: The polie want to know the hotel. Mr Foster stayed there two weeks ago

8: Yoy did not tell us the reason. We have to cut down our daily expenses for that reason

9: The day was rainy. She left on that day

10: The reason has not been told yet. The president will come to that city for this reason

11: Phuong Thao is a singer. You like her music best

12: she coudn't come to the party. This is a pity

13: that man is a artist. I do not remember the man is name

1) tam giác ABC góc A=90° đường cao AH tính sinB sinC trong mỗi trường hợp sau

a) AB=13cm, BH=5cm

b) BH=0,3dm , CH=4cm

2) tam giác nhọn ABC các đường cao BD và CE chứng minh ADE=ABC

3) tam giác nhọn ABC biết AB=c, AC=b ,BC=a chứng minh a phần sinA bằng b phần sinB bằng c phần sinC

Cho 10g CaCO3 tác dụng vừa đủ với dung dịch HCl 2M. Tính

a) thể tích khí thu được

b) thể tích dung dịch HCl đã dùng

c) cho toàn bộ khí sinh ra đi vào bình có chứa 50g dung dịch NaOH 10% tính khối lượng muối thu được sau phản ứng

Điền các số thích hợp vào ô trống

Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.

This, like every drug discovery in the world, are also a risky venture with dubious chances of success.

A. drug discovery

B. are also

C. with

D. chances of

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 23 to 27.

Years ago, in their private family role, women quite often dominate the male members of the household. Women were quite (23)____ to their families. However, the public role of women has changed (24)______since the beginning of World War II. During the war, men were away from home to the battle. As a (25)_____women were in complete control of the home. They found themselves doing double and sometimes triple duty. They began to take over the work of their absent husbands and to work outside. They accounted for 73% of the industrial labor force.
Women were forced by economic realities to work in the factories. The women (26)______ worked there were paid low wages, lived in crowded and small dormitories. (27)______they found themselves a place as active members of society.

Điền vào ô 25.

A. change

B. result

C. success

D. opportunity