1. Mai speaks English more fluently than her sister

2. It's better to avoid spending time on computer games too much

3. Among the ethnic groups the Kinh have the largest population

4. Nowadays teenager rely on technology more than the past

1/ Mai speaks English more fluently than her sister.

2/It's better to avoid spending too much time on computer games.

3/Among ethnic groups, the Kinh has the largest population.

4/ Nowadays, teenagers rely on technology than in the past.

câu 3 với câu 4 chép đề sai nha bạn, 3/ phải là "has" chứ ko phải "have"

4/ thiếu "in"