I go on the internet every day , but I've never (1)....... more than an hour at a time online . I've got laptop and also a smartphone, so I can (2).... The internet anywhere. Today, for instance, I've been (3)..... Three times.
Mainly I just (4)...... my friends. I read online magazines and I look (5)...... information, too. I also compare prices of things, (6) ...... I've never bought anything online because I don't think it's safe.
I'n not an internet addict,but some of my friends.(7)..... One friend of mine always looks(8)....because he spends all night online . Althought he is got of bad marks for the ẽams, he hasn't (9).... his habits
In my experience , it's very useful for people who use the internet(10).....
1. A spend B. Spending C.spent
2. A. Have B. Use C. Play
3. A online B. Internet C. Computer
4 A. Write B. Email C. Send
5 A at B in C for
6 A because B but C althoght
7 A is B were C are
8 A tired B hard C happily
9 A change B to change C changed
10 A sensible B sensibly C seénibleness

I . making the meaningful sentences with the words given and some other additions

1. We / countryside / holiday / next summer

We will go the the countryside for our holiday next summer.

2. People / rural / friendly / than / cities

People in the rural are more friendly than people in the cities.

3. Food / countryside / less / expensive / towns

Food in the countryside is less expensive than food in the towns.

4. There / much / pollution / big cities / countries

There is much pollution in big cities than in the countries.

5. There / much / fresh air / country / big cities

There is much fresh air in the country than there is in the big cities.

Chuyển sang câu bị đông:

32. Someone stole all her valuable jewelry last nice

All her valuable jewelry was stolen last night.

33. A doctor has just examined John

John has just been examined by a doctor.

34. The fire destroyed many house in my neighborhood

Many houses in my neighborhood were destroyed by the fire.

35. Tom will return those book to the library tomorrow

Those books will be returned to the library tomorrow.

36. Bad weather has delayed Flight 202 from Miami

Flight 202 from Miami has been delayed by bad weather.

37. People use milk to make butter

Milk is used to make butter.

38. You must keep your room tidy.

Your room must be kept tidy.

39. Nobody saw her at the party last night.

She wasn't seen at the party last night.

40. The government has not changed the regulation.

The regulation hasn;t been changed by the government.

Nửa chu vi thửa ruộng là 240 : 2 = 120 (m)

Chiều dài thửa ruộng là (120 + 42) : 2 = 81 (m)

Chiều rộng thửa ruộng là 120 - 81 = 39 (m)

Diện tích thửa ruộng là 81 x 39 = 3159 (m²)

80%=8/10

có E=\(x^2+7x+1\)

       =\(x^2+2.\frac{7}{2}x+\frac{49}{4}+1-\frac{49}{4}\)

        =\(\left(x+\frac{7}{2}\right)^2-\frac{45}{4}\)

ta có (x+7/2)²\(\ge0\)với mọi x

nên E\(\ge\frac{-45}{4}\)

vậy min E=\(\frac{-45}{4}\) đạt đc khi x+7/2=0=> c=-7/2

số học sinh nữ là 35 : 100 x 40 = 14

số học sinh nam là      35 - 14 = 21

                        tick nha Công Chúa Auora

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98 x 0,98 + 0,98 + 0,98

= 98 x 0,98 + 0,98 x 1 + 0,98 x 1

= 0,98 x (98  + 1  + 1)

= 0,98 x 100 = 98 

   98 x 0,98 + 0,98 + 0,98

= 98 x 0,98 x 3

= Tự túc nhé

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