1. was walking (QKTD với dấu hiệu: while và saw)

2. has worked (HTHT với dấu hiệu since)

3. seeing (remember Ving: nhớ đã làm gì, remember to V: nhớ phải làm gì trong tương lai hoặc hiện tại)

4. driving (driving licence: bằng lái xe)

5. lovely

6. celebrations

7. irresponsibly (sau động từ dùng trạng từ)

8. to using (be used to Ving: quen với việc gì)

whose

whose

(chỉ sự sở hữu)

câu 7 tức là at hoặc on nhé

1. in

2. for - at

3. on - on

4. at - on

5. on

6. at

7. at/ on

They work to protect wildlife and environment

They make sure everyone has enough food

Wash bottles before you recycle them

Don't throw away food

1. Mary asked John if he could carry her suitcase.

2. He is the most careful in my class

3. It is dangerous to ride a bicycle so fast

4. She asked the children not to stay up late