2.Some students are into surfing the net to search information for their homework.
Be into +Ving : thích làm điều gì đó
3.Mike felt stressed,so he watched a comedy on YouTube.
4.How many ethinic groups are there in Vietnam?
How many + danh từ đếm được số nhiều + are there?
5.Leisure activities often bring balance between study and relaxation.
6.Mai detests surfing the net because she thinks it takes a lot of time.
detest + V-ing: ghét làm gì
7.Because he gets up early in this morning,he can finish milking his cows
HTĐ : S +V(s-es)