Ta nhìn thấy mảnh giấy trắng khi đèn bật sáng.Đó là vì đèn chiếu sáng mảnh giấy rồi mảnh giấy hắt lại ánh sáng, cuối cùng ánh sáng truyền vào mắt ta. Tức là ta nhìn thấy mảnh giấy trắng vì có ánh sáng từ mảnh giấy truyền vào mắt ta.
 

1. There isn't ........... milk in the fridge. (A.some / B. any / C. a lot / D. many)

2. If we all use this kind of bag, we ........ the environment. (A. are / B. were / C. will help / D. will do)

3. This is, ......... woman I've ever met. (A. the borest / B. the most boring / C. the boring / D. the most bored)

4. ........... eat too much sugar. It's not good for you. (A. Do / B. Don't / C. Please / C. Can't)

5. If the Earth ......... warmer, the sea level. (A. are/will rise //B. is/will be rise //C. is/will rise //D. are/rise)

chiều cao của bể là:1.2*1.5=1.8(m)

thể tích của bể là:2*1.2*1.8=4.32(m3)

                                    =4320dm3=4320l

a)trong bể có:4320/100*72=3110.4(l) 

b)thời gian đầy bể là:4320/900=4.8 giờ                                     NHỚ LIKE ĐẤY

                              đáp số:a)3110,4

                                       b)4,8 giờ

1. let's meet in front of the theater.=> How.....about meeting in front of the theater ?......
2, The water is too hot for me to drink.=> The water....isn't cold enough for me to drink ......
3, I spend two hours to read that book.=> It takes....me two hours reading that book.........
4, How old are you?.=>What....is your age ?..............
5, I will phone you tomorow morning.=> I will give. you a phone to morrow morning......
6, There are nine hundered students in my school.=> My school...has nine hundered students .............
7, you should go to school on time.=> You had better....to go to school on time.........
8, No one in my class is taller than her.=>she is.....the tallest girl in my class.......
9, He is a good football player.=> he plays.....football very well.......

1. My brother is a careful ( drive ).

2. (luck ) Unluckily I forgot my book at home.

3. He learns how to repair ( house )household appliances.

4. American students take part in different ( act )activities at recess.

5. He is a ( home ) homeless child.

6. Playing  video game too much  brings  a lot of  disadvantages ( advantage).

1. Smoking is very ( harm ).harmful

2. Minh is scared because he thinks the dentist is( kind).unkind

3. The children like the ( colour ) skirt.colourful

4. He looks very ( sport ).sporty

5. I sit and read about ( wonder ) things.wonderful 

6. The teacher was ( please ) with the result of your exam.pleasure

de ma ban .vi G la trong tam nen AG la duong trung tuyen cua tam giac ABC ma tam giac ABC can nen dong thoi la duong  phan giac.MAt khac I cach deu 3 canh nen ai la duong phan giac.dan den a,g,i thang hang

 1. He is probably one of the  most famuos (play ) player in our football team.

2. They are going to annuonce their ( dicide )dicision tommorow.

3. We had a happy (child) children together.

4. He had an accident last day bacause he drove ( care ) carelessly 

5. The girl make-up to ( beautiful )beautifully themselves.

6. Eating too much is ( health) unhealthy.      

7. This book is (interest)interesting.I am ( interest ) interested in it .

8. We will have a / an ( success) examination.