Nêu vai trò của bò sát? em hãy đề ra các biện pháp bảo vệ các loài bò sát.

Vì sao khủng long bị diệt vong, các loài bò sát cỡ nhỏ vẫn tồn tại đến ngày nay?

Give the correct form of verbs.( chia động từ)

1. The dentist (fill)…………………the cavity in my tooth yesterday.

2. What’s the matter, Minh? I ( have)…………….a toothache.

3. The students ( not go) …………..to school last week.

4. What ………..you( do)…………last night? I ( do) …………my homework.

5. We should ( brush )……………..our teeth twice a day.

EX 1: Fill in the blanks with suitable prepositions.( in, on, of, to, at, about…..)

1. My mother takes care......the family.

2. I smiled.........the child and said " Hello".

3. She always worried.............her children.

4. Milk is good......your health.

5. Most children are scared.............seeing the dentist.

6. The dentist looked .........my teeth.

EX 2: Give the correct form of verbs.( chia động từ)

1. The dentist (fill)…………………the cavity in my tooth yesterday.

2. What’s the matter, Minh? I ( have)…………….a toothache.

3. The students ( not go) …………..to school last week.

4. What ………..you( do)…………last night? I ( do) …………my homework.

5. We should ( brush )……………..our teeth twice a day.