1.maria works so hard that she always top of her class

-> maria is.......

2. My grandfather used to take me fishing every sunday

-> my grandfather would.......

Tính diện tích tam giác ABC biết:BC=a,góc B=45 độ,góc C=60 độ

Dave got (1)…………early. He put (2)…………his clothes and went (3)………..the stairs (4)………..the kitchen. He sat (5)…………the table (6)………..the window and looked (7)………….the garden and saw his father sitting (8) ……….a tree. When he had finished eating he went (9)………….the door, (10)………….and (11)………...the garden to join his father. He sat (12)………….him on the ground and looked seriously (13)…………his eyes. “Can you lend me some money, Dad?” he asked. His father said nothing and put his hand (14)……….his pocket and took (15)………..five dollars note. He gave it (16)………..him and said “no more”.

Every four years 180 or more nations send their best athletes to compete (1)______ the Olympic Games. As many
(2)_______ 20,000 sportmen and sportswomen take part in more than 20 different sports. Milllions (3 )______ people
around the world watch the events (4)_______ television.
The inspiration for today’s Olympics came (5)_______ ancient Greek Games (6)______ more than 2,700 years ago.
The first modern Olympic Games began (7)______ Athens, Greece, in 1896. Individual excellence and team
achievement are the theme of the Olympic Games, not competitions (8)_______ nations. So the International Olympic
Committee chooses a city, not a country, to host the Games. No country “wins” the Games, and there is no prize
money. Instead, individual and teams compete (9)_______ gold, silver and bronze medals, and (10)_______ the glory
of taking part

tìm M max =-x^2-2x+5

tìm

B min =x^2+8x

C min=5x^2+x+7

D min=3/-4x^2+4X-7

(1)cho 13g kẽm vào 100g dung dịch hcl 7,3% tính C% muối thu được và thể tích khí sinh ra (đktc)

(2) cho 0,3 g kim loại ( hóa trị tối đa là III) tác dụng hết với nước thu được 0,168l . xác định tên kim loại

(3) để đốt cháy hết 68g khí CO và H2 cần 89,6 l khí O2 (đktc). xác định thành phần % khối lượng của các khí trong hỗn hợp ban đầu

cho 0,96g Mg vào 200g dung dịch HCl 10%

hỏi C% chất sau PƯ

cho 2,3 g kim loại hóa trị I vào cốc nước dư thu được 1,12 l khí ở đktc. xác định tên kim loại