1. I accidentally _______ Mike when I was crossing a street downtown yesterday. A. caught sight of B. kept an eye on C. paid attention to D. lost touch with 2. My mother told me to _______ for an electrician when her fan was out of order. A. send B. write C. rent D. turn 3. It is very important for a firm or a company to keep _______ the changes in the market. A. pace of B. track about C. touch with D. up with 4. The forecast has revealed that the world’s reserves of fossil fuel will have _______ by 2015. A. taken over B. caught up C. used off D. run out 5. Even if you are rich, you should save some money for a _______ day. A. windy B. rainy C. foggy D. snowy

I-Underline and rewrite the mispelt words a. A boy fell off his bicycle and became unconsious. b. An ambulance came to take him to the hospital. c. He was taken to the emmergency unit. Lm giúp mik nha cần gấp ọ

nút lệnh nào được sử dụng để chọn màu chữ

Hộ mk vs các bạn ei mk cần rất gấp

1.đặt tính rồi tính(ko đặt ngang) 52,27+18,8 391,08-3,648

Chứng minh phương trình x^2+y^2=z^2 có vô số nghiệm.

1. I wish I hadn't said it. If only I could _______. A. turn the clock round B. turn the clock down C. turn the clock back D. turn the clock forward 2. I just took it _______ that he’d always be available. A. into account B. for granted C. into consideration D. easy 3. My car is getting unreliable; I think I'll trade it _______ for a new one. A. in B. off C. up D. away 4. Anne persisted _______ her search for the truth about what had happened. A. on B. about C. at D. In 5. The old houses were _______ down to make way for a block of flats. A. banged B. put C. hit D. knocked

Tìm số nguyên x,y biết a, x² - y²=91 b, x^6 +3x³ +1 =y^4 c, x² + 4x - y² =1

phân tích câu thơ: Người ngắm trăng soi ngoài cửa sổ, trăng nhòm khe cửa ngắm nhà thơ ko phải vt thành bài hay thành đoạn mà là chỉ ra nghệ thuật xong suy a ý nghĩa, nội dung ý

Cho a, b > 0 thỏa mãn: a + b < ab. Chứng minh rằng : a + b > 4 help me, please!!!