a)

1-F                     2-F                         3-F                      4-T                       5-F

b)

1.Last Saturday, they were went a book fair near school.

2.They met a lot of our classmates.

3.Yes, they did.

4.No, he didn't.

5.They went came home at half past four in the afternoon.

6.Yes, they did.

a,

1. F (near Nam's school)

2. F (a lot of classmates)

3. F (Nam → Phong)

4. T

5. F (5:30 → 4:30)

b,

1. They went to a book fair near their school

2. they met a lot of their classmates

3. Yes, they did

4. No, he didn't

5. They came home at half past four (4:30)

6. Yes, they did

CHÚC BẠN HỌC TỐT! 

Cho mk xin ctlhn nha! Thanks nhìu!