phân tích khổ 3,4 bài thơ" Viếng lăng Bác" không chép trên mạng 

cho ΔABC nọn ội tiếp đường tròn O. Các đường co AD,BE,CF cắt nhau tại H.

a)CM các tứ giác BFEC,BFHD nt, xđ tâm và đk của đg tròn

b)Cm:DH là tia phân giác của EDF

c) Kẻ AD cắt BC tại M. Chứng minh tam giác BMH cân

1.we / stop / destroy / forest / as / they / important / our environment

2.They / suggest / we / use / public transports / instead / motobikes

It is very important_____(1)water carefully.Here are some _____(2)you can use less water.First,you should___(3)that you turn_____(4)the faucets tightly.They should______(5)in the bathroom or kitchen sink.Second,you should not keep the water on for a long time.You should turn it off while you are doing something else.It should be off while you are shaving or____(6) your teeth.It should also be off while you are washing the dishes.Finally,____(7)the summer you should water your garden___(8)the evening.That way you will not lose a lot of water.During the day the sun dries up the earth too quickly.

1.   A.for using  B.to use  C.use   D.using

2.   A.roads       B.paths   C.streets  D.ways

3.   A.be sure    B.sure     C.to sure  D.to be sure

4.   A.on            B.right     C.off         D.left

5.   A.drip          B.to drip  C.not drip D.not to drip

6.   A.clean        B.rubbing  C.washing  D.brushing

7.   A.on             B.in         C.at         D.when

8.   A.on             B.in          C.at         D.when 

I
1.They are_____that people use energy-saving bulbs to save energy.
A.please     B.pleased      C. pleasing      D.pleasure
2.You should turn____ the gas after you have finished cooking.
A.on            B.off               C.up                D.down
3.My mother was very tired,____I helped her with the housework.
A.because  B.although     C.so                 D.but
II
1.They live____in a small village.(Happy)
2.You should spend your money and energy as____as possible.(Economy)
3.I want to see the___of environment from the local authority.(protect)
4.We can save natural resources by____bottles and cans.(recycle)
5.The old man walked____to the park.(slow)
6.He is_____beause they have used electricity to catch.(disappoint)
III
Tropical rain forests are found in Amazon region of South Amercia,Central America,Africa,and Southeast Asia.Rain forests are very important to the world's climate.The Amazon rain forest alone receives about 30 to 40 percent of the total rainfall on the earth and produces about the same percentage of the world's oxygen.Some scientists believe that the decresing size of rain forests will affect the climate on earth, making it uncomfortable or even dangerous for life.Saving our rain forests is an international problem.One country or even a few countries can not solve the problem alone. The nations of the world must work together to find a solution before it is to late.
*Answer the questions:

1.How are the rain forests to the world's climate? ___________________________
2.Does Amazon rain forest produce about 30 to 40 percent of the world's oxygen?________________________________________________________________
3.Where are tropical rain forests found?__________________________________
*Decide the following statements are true(T) or false (F).Check the boxes
4.Some scientists believe that life is dangerous because of the decreasing size of     
rain forests.
5.Saving our rain forests is only a national problem.
6.A solution of saving our rain forest must be found by a lot of countries in the world