2,Because Lan is sick,she didn't go to school yesterday

3,How long is the Great Wall?

4,I prefer listening the radio at home to going to the corner 

5,Can he look after himself when his mother is away?

6,Mr.Hoang spent half an hour walking to work yesterday

7, How much does the cap cost?

8,our house is the oldest house in the living centre

9,Hoa's collection has eight hundred stamps

10,Our summer vacation lasts 2 months

II,

B=>to me=>for me

D=>someday=>one day

D=>on march=>in march

B=>gathering=>gather

B=>hear=>hearing

A=>collect=>collection

D=>in the radio=>on the radio

B=>play tennis=>playing tennis

C=>so=>too

A=>turn in=>turn on

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