Cho hình bình hành ABCD. Gọi E là trung điểm của AD, F là trung điểm BC

a) Chứng minh BE = DF và góc ABE = góc CDF

b) Chứng minh tứ giác EBFD là hình bình hành

c) Chứng minh các đường thẳng EF, DB và AC đồng qui

Phàn II sách Lịch sử 8 bài 8 trang 52: Những tiến bộ về khoa học tự nhiên

Ngoài những nhà khoa học trong SGK, hãy giúp mk tìm thêm 3-5 nha khoa học khác tìm hiểu về họ ( thông tin cá nhân, câu chuyện về phát minh,...)

Mk sắp phải nộp r, mong các bạn giúp đỡ

II. Write about 150 to 200 words to give your own opinion on the following topic

PHYSICAL EXERCISES ARE VERY USEFUL TO OUR HEALTH

I. Complete the second sentence so that it has similar meaning to the first one.

64. The book was less expensive than I had expacted

-> The book didn't .....................................................

65. Man has never had such efficient servants as computers.

-> Computers ................................................................

66. The fire will go out if he doesn't put more wood on

-> Unless ......................................................................

67. " I am myself a stranger here" said the women

-> The woman said ..........................................................

68. I am sure she was beautiful when she was young

-> She must ............................................................

Read the following passage and fill each numbered blank with one suitable word (10 points).

I enjoy walking. It’s good exercise and it takes me (51) _______ of the town and into the country. I think that’s (52) _______ I have a dog. She needs to go out and so I have a (53)______ to go for a walk. I go every Sunday and it doesn’t (54) _______ to me if it’s so cold, windy and raining or a beautiful sunny day. I just love to get away from people and be (55) _______ for a few hours. I always go home at the same time every Sunday (56) _______ walk over the hills to a little village in the country. The walk isn’t very (57) _______, only about an hour, but it’s quite hard work because I have to walk up the hill and (58)_______ the other side. When I get to the village, I go to the pub for a beer and (59) _______ food. After lunch, I walk back long a different path and arrive home (60)________ time for tea.