Answer: 

4, Does Mark watch television or listen to music after school?

5, They often go to the park at weekend

--------------------------------

HTĐ: Do/Does + S + V0 + O?

after + N: sau cái gì

at weekend: cuối tuần

go to swh: đi tới đâu

V or V

`4.`

$\text{Form:}$

`+)` Do/Does + S + V(inf) + adv/O

`=>` Does Mark watch television or listen to music after school?

`5.`

$\text{Form:}$

`+)` S + trạng từ chỉ tần suất + V(HTĐ) + adv/O

`=>` They often go to the park at weekend.

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