1.are-grinded

2.is being removed

3.is made

4.has been used

5.are stored

6.was drained

7.be touched

8.was invented

9.was awarded

10.was brought

Câu 5:

\(\dfrac{x}{y}=a\Rightarrow\dfrac{x}{a}=\dfrac{y}{1}=\dfrac{x-y}{a-1}=\dfrac{x+y}{a+1}\)

\(\Rightarrow\dfrac{x+y}{x-y}=\dfrac{a+1}{a-1}\)

Câu 6:

\(9x=5y\Rightarrow\dfrac{x}{5}=\dfrac{y}{9}\)

\(\Rightarrow\dfrac{x}{5}=\dfrac{y}{9}=\dfrac{3x}{15}=\dfrac{2y}{18}=\dfrac{3x-2y}{15-18}=\dfrac{12}{-3}=-4\)

\(\Rightarrow\left\{{}\begin{matrix}x=\left(-4\right).5=-20\\y=\left(-4\right).9=-36\end{matrix}\right.\)

Câu 7:

\(\dfrac{x}{-5}=\dfrac{y}{7}=\dfrac{x+y}{-5+7}=\dfrac{-10}{2}=-5\)

\(\Rightarrow\left\{{}\begin{matrix}x=\left(-5\right).\left(-5\right)=25\\y=\left(-5\right).7=-35\end{matrix}\right.\)

All of the special holidays in my country, I Tet the most. Tet is an occasion to everyone get together in warm atmosphere. Before Tet holiday, Everyone prepares many things and decorates their house. I plant a lot of flowers in front of my house and buy many things such as clothes, foods ...

Besides, most of the streets also are decorated beautifully with colorful lights and flowers. During Tet, I spends more time on visiting my relatives, friends. Especially, I give to each other the best wishes for the new year. Tet is an opportunity for children receive lucky money. There is a funny thing that people try to avoid argument or saying any bad things at Tet. I love Tet holiday!

Dịch

Tất cả các ngày lễ đặc biệt ở đất nước tôi, tôi thích nhất Tết. Tết là dịp để tất cả mọi người cùng nhau trong bầu không khí ấm áp. Trước kỳ nghỉ Tết, mọi người chuẩn bị nhiều thứ và trang trí nhà cửa. Tôi trồng nhiều hoa ở trước nhà tôi và mua nhiều thứ như quần áo, thực phẩm ...

Bên cạnh đó, hầu hết các đường phố cũng được trang trí đẹp mắt với ánh sáng đầy màu sắc và hoa. Trong dịp Tết, tôi dành nhiều thời gian hơn cho thăm thân nhân, bạn bè. Đặc biệt, tôi trao cho nhau những lời chúc tốt đẹp nhất cho năm mới. Tết là cơ hội để trẻ em được may mắn. Có một điều buồn cười là mọi người cố gắng tránh tranh cãi hoặc nói bất cứ điều xấu nào vào dịp Tết. Tôi yêu Tết!

Tet is a national and family festival. It is an occasion for every Vietnamese to have a good time while thinking about the last year and the next year. At Tet, spring fairs are organized, streets and public buildings are brightly decorated and almost all shops are crowded with people shopping for Tet. At home, every is tidied, special food is cooked,offerings of food, fresh water, flowers and betel are made on the family altar with burning joss- sks scenting the air. First-footing is made when the lucky visitor comes and children are given lucky money wrapped in a red tiny envelope. Tet is also a time for peace and love. During Tet, children often behave well and friends, relatives and neighbors give each other best wishes for the new year.

Chúc hok tốt

Hello, my name is Phuong. I am 13 years old. I live with my family in Vinh city, Nghe An province, Vietnam. In my country, spring is the best season of the year because it has Tet holiday. In Tet holiday, the streets are very beautiful with green trees , flowers, and funny noisy. In every house, there are a big tree with many love flowers and plants. Any things else? Yes, there are a lot of delicous drinks, cakes and candies. In Tet holiday, children have money from adults. It's so greet. We enjoy a happy Tet holiday every years. Do you know out happy holiday in spring? It's Tet holiday. What about you? Can you tell me about your country 's best holiday? Thank you so much.