To me, one of my best friends is Tin . Tin is only over eighteen but he is well developed; so he is thought to be twenty or more. He has black hair, a broad forehead, a straight nose and bright eyes. He is very good-looking. He has a kind heart and is easy to get on with everybody. We have been friends for a very long time. The deeper our mutual understanding becomes the more we feel closely attached to each other. “Birds of a feather flock together”, Tin and I are keen on learning. We are the best pupils in our class. Tin is always at the top. He is good at every subject, but he never shows pride in his abilities and always tries to learn harder.

Tin’s family is not rich enough. His parents are retired workers. Realizing the hardships of his parents, although he is absorbed in his study, he often spends most of his spare time doing useful things to help his parents in their old age. He gets up early in the morning to have enough time to deliver newspapers to subscribers before going to school. After school in the afternoon, he repairs bicycles and motorbikes. Therefore the money he gets from his manual job is sufficient for his school fees and for his parents’ presents. I like Tin very much because of his honesty and straight forwardness. He is always ready to help his weak friends in their study; as a result, lots of friends, thanks to his whole-hearted help, have become good ones.

1. My best friend (play)  has played basketball for five years.(hiện tại hoàn thành)

2. Do you (love) love water activities?  (hiện tại đơn)

3. How many times has Lan (watch)  watched this game show.(hiện tại hoàn thành)

4. They (get) get up late this morning, so they (miss) miss the trip to Da Nang city. (hiện tại đơn)

5. The students (not,be) haven't ever been so excited like this before. (hiện tại hoàn thành)

1.My mum (buy) bought me a present yesterday, but I (not open) haven't opened it yet.( vế trước quá khứ đơn, vế sau hiện tại hoàn thành)

2.What (happen) happened  to the Philippines in the early November 2013? (quá khứ đơn)

3.The typhoon Haiyan (pass) passed this country and (kill) killed thousands of people.  (quá khứ đơn)

4.The animal programme (start) starts at 9:00 PM and (finish) finishes at 9:30 PM every day. (hiện tại đơn)

5.This is the first time Peter (do) has done karate.( hiện tại hoàn thành)

Nhung : Do you ever (1.eat) eat a Philadelphia cheese steak?
Nora: Yes I have
Nhung : Really? Did you(2.be) went to Philadelphia? (trong ngoặc phải là "go" nhé)
Nora : Yes,I ( 3.be) went there twice . There ( 4.be) are too many famous places inthe city.  (thiếu "there" nhé)
Nhung : Did you ( 5. visit ) visit the Constitution Centre ?
Nora : No ,I haven't but I ( 6.see) saw the Liberty Bell . Look at this post card

1.It rains a lot in the wet season.

2.The rain isn't heavy.It's a light rain.

3.In the winter,the weather is never hot.It's always cold.

4.The weather is often sunny in the dry season.

5.It is often cool in the fall.

6.It rains all day.It's a wet day

1. Among my friends, I cherish the most is Ha.She is a good student of my class, she
lived with her
parents in a small house near my house. She has long black hair, oval face
and eyes speak. What particula
rly struck me about her was the smile. She looks so cute
when he smiles. She is a form of friends that I can share everything. She always believed
and helped me in every situation. She is friendly, gentle and endearing all friends. She
likes Literacy, read
ing, listening to music and go under heaven mua.Chung I have a lot in
common with each other, has become good friends over the past 5 years. Although time
has passed long in any case, I'm and Ha also trying to keep this friendship

2.e secondary class. He was a little overwieght and not
quite tall, however, his outlook with bright complexion and crew hair was appealing.
frankly, at first he hadn't left any impression on me, but, once we were set to sit together,
i found him a interesti
ng and jovial person.Moreover, he was very active, it appeared that
if he didn't take part in the class activity, the things wouldn't have run smoothly. Yet,
Chien's studying was not good, therefore, wherever he asked me anything about the
lesson, i awlay
s tried my best to explain it to him. On the other hand, thanks to Chien, i
learnt many fascinating games, or good amusement places after the class. what a pity that
we no longer studied in the same school. My family moved to another city, we scacrely
meet
each other. however, we still keep in touch and we are always best friend

1.There is a film on television tonight. Are you going to watch it?

2.No, I’m too tired. I’m going to have an early night.

3.I heard Ann has won a lot of money. What is she going to do with it ?

4.I’ve heard she is going to travel round the world.

5.No, but I’m just going to make it

Mèo và rắn đều bắt chuột làm thức ăn. Chuột gây ra nhiều tác hại cho đời sống con người: Phá hoại mùa màng, Phá hoại công trình, Gieo rắc dịch bệnh; Phân, nước tiểu, xác chuột gây ô nhiễm môi trường,...

=> Khi số lượng mèo nuôi và rắn trong tự nhên bị suy giảm sẽ mất nguồn thiên địch để diệt chuột

=> Số lượng chuột sẽ gia tăng và tiếp tục gây hại

-(-a+b+b)+(b+b-1)=a-b-b+b+b-1

                         =a+ ((-b)+(-b)+b+b) -1

                         =a+0-1

                         =a-1

(b-c+6)-(7-a+b)+c=b-c+6-7+a-b+c

                         =b+(-c)+6+(-7)+a+(-b)+c

                         =(b+(-b)) + ((-c)+c) + a + (6+(-7))

                         =0+0+a+(-1)

                         =a-1

Vậy -(-a+b+b)+(b+b-1)=(b-c+6)-(7-a+b)+c

Bài này là bài toán 93 ở onlinemath đúng không hoc24!