1.live

2.has

3.is

4.go

5.do

6.works

1.at

2.in/of

3.behind

4.to

5.to

6.in

7.on

8.near

9.to

10.in

Gọi số tự nhiên đó là abc3 ; nếu bỏ chữ số tận cùng thì số mới là abc

Ta có

abc3 - abc = (1000a+100b+10c+3)-(100a+10b+c)

                 => 900a+90b+9c+3=1992

                 => 900a+90b+9c=1989

                 => 9(100a+10b+c)=1989

                 => 100a + 10b + c = 221

                 => abc = 221

                 => abc3 = 2213

Vậy số đó là 2213

r= \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}\)

=> 2r = \(1+\frac{1}{2}+\frac{1}{4}+...+\frac{1}{32}\)

=> 2r - r = \(1-\frac{1}{64}\)

Vậy r =\(\frac{63}{64}\)

1.aren't

2.are playing

3.has

4.are

5,aren't

6.walks

7.is doing

8.are ... doing

1.He gets dressed at six o'clock.

2.We have English on Wendnesday.

3.What time do you go to school ?

4.What are you doing now ?

5.There are many mountains and rivers around town our.

6.Thu's books are on the table.

7.We play volleyball acfter school.

8.How many floors does your scool have ?

1.in

2.of

3.to

4.on

5.between

6.on