1. It's nearly two years since we left high school.

\(\rightarrow\) We ...........

2. It's raining, so we can't get to the birthday party in time

\(\rightarrow\) if ..............

3. they have built a new local library near my school

\(\rightarrow\) A new local library ................

4. Did you meet Liz at the station this morning?

\(\rightarrow\) lan asked ba ....................

5. The book was interesting to most children

\(\rightarrow\) Most children .....................

6. There's usually plenty of sunshine in Southern countries

\(\rightarrow\) It's usually ..............

7. lan was late beacause she walked all the way to school

\(\rightarrow\) Lan walked ..............

8.The reason of his leaving early was that the room was very crowded

\(\rightarrow\) He left ....................

9. My absence from school yesterday made the teacher angry

\(\rightarrow\) The teacher ........................

10. They continued to walk in spite of the rain

\(\rightarrow\) they went ........................

11. Look after your sister when your parents are away on business

\(\rightarrow\)You should ...................

Ai có sách " Tổng hợp ngữ pháp và bài tập Tiếng anh 9 thí điểm " ko ạ

a, chứng minh:

\(n^4+\frac{1}{4}=\left[\left(n-1\right)n+\frac{1}{2}\right].\left[\left(n+1\right)n+\frac{1}{2}\right]\)

b, Áp dụng câu a) thu gọn:

\(\frac{\left(1^4+\frac{1}{4}\right).\left(3^4+\frac{1}{4}\right)...\left(13^4+\frac{1}{4}\right)}{\left(2^4+\frac{1}{4}\right).\left(4^4+\frac{1}{4}\right)...\left(14^4+\frac{1}{4}\right)}\)

Cho tam giác ABC cân tại A có AH là đường cao. gọi M và N lần lượt là trung điểm của AB và AC. biết AH = 16cm, BC = 12cm

a, tính diện tích tam giác ABC, cạnh MN

b, Gọi E là điểm đối xứng của H qua M. Chứng minh AHBE là hình chữ nhật

c, Gọi F là điểm đối xứng của A qua H. chứng minh ABFC là hình thoi

d, Gọi K là hình chiếu của H lên cạnh FC, I là trung điểm của HK. chứng minh \(BK\perp IF\)

Cho hình bình hành ABCD. Gọi E sao cho BDCE là hình bình hành. Gọi F sao cho BDFC là hình bình hành. Chứng minh rằng:

a, A đối xứng với E qua B

b, C là trung điểm của EF

c, AC, BF, DE cắt nhau tại một điểm

d, gọi M là giao điểm của CD và BF, N là giao điểm của AM và CF. Chứng minh rằng FC = 3NC

Rút gọn

\(\frac{\left(4x-3\right)^2-9x^2}{-7x^2+24x-9}\)

cho tam giác ABc có trực tâm AH. Gọi M và N lần lượt là trung điểm của BC và AC. Gọi O là giao điểm của các đường trung trực của tam giác và G là trọng tâm của tam giác. Chứng minh:

a) \(\Delta OMN\sim\Delta HAB\Rightarrow AH=2OM\)

b) \(\Delta HAG\sim\Delta OMG\)

c) H, G, O thẳng hàng, GH = 2.GO

Tìm các giá trị của x để \(\frac{11-x}{x+1}\) có giá trị nguyên

Hãy phân tích phần I "Chiến tranh và những người bản xứ" trong bài 'Thuế máu" của

Nguyễn Ái Quốc

#mọi_người_đừng_sao_chép_nha!!!

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

A ghostly animal creeps silently through a Florida swamp. It’s a rare type of big cat known as a Florida panther, one of only 80 to 100 such panthers left in the world. Scientists must work to save these remaining panthers from extinction, but their secretive nature is making it difficult. They are attaching a special transmitter to each Florida panther so they can follow their movements, range, and habits. The technology these transmitters use is called satellite tracking.

The scientists are dedicated professionals, but they are not pioneers. Their colleagues before them have attached tiny transmitters to many different kinds of wild animals, including birds, fish, and big cats. So the Florida scientists are using their methods. Firstly, they must trap and tranquillize the panther. Then, the transmitter is attached to a harness and strapped to the panther’s body. Each harness is custom designed and manually adjusted for panthers so it fits comfortably. Scientists don’t want the transmitter to interfere with the panther’s natural habits. The point of tracking them is to find out as much as they can about their natural habits.

Once the tracking transmitter is in place, the information it records is sent to an orbiting satellite. The satellite can see the transmitter that is attached to the panther, even when it is out of sight of a biologist on the ground. The satellite collects information from the transmitter about the

panther’s exact location. Once the information is received, it is transmitted back to Earth so it can be recorded by the scientists.

Scientists can use the information in many different ways. They can follow the panthers on the ground and observe their behavior. Alternatively, they can use the information to determine the panthers’ ranges and to understand their social patterns. They can also track how environmental changes like weather conditions affect their movements and health. All this information can be used to provide ideal conditions for the endangered panthers. It can also be used to protect the panthers from danger.

In the end, the panther silently slips away through the trees. Around its shoulders a transmitter is sending signals via satellite to a dedicated biologist. The biologist is using the information the transmitter provides to save the Florida panthers from extinction. With the help of satellite tracking these beautiful cats have a better chance of survival in the modern world.

(Adapted from http://www.thereadingplanet.com)

The word "their" in paragraph 4 refers to                                      

A. the panthers’ ranges 

B. the transmitters

C. the panthers

D. the scientists