chia động từ:

1,if he (call),i will give it to you

2,if the weather (be) cool,we will go to the park tomorrow

3,if they arrive on time,i (speak) with them

4,how you (feel) if you were in my position?

5,will you send me a post card if you (visit) mexico?

6,they would be up set if i (tell) them what happened

7,if you (fell) tired,pleae take a rest

8,if we (not hurry)we will be late again

9,if i (be) her ,i would spend more time practising english

10,what (happen) if the sun suddenly disappeared?

chia động từ :

1.we can save natural resources if we (use) solar energy

2.he'd have a lot of friends if he (not be) so selfish

3.if it doesn't rain soon,the crop (lose)

4.if these (not be) electricity,people (can't) use house hold appdiances

5.unless he (study) hard ,he will pass the final exam

6.if the sun(stop) shining ,what (happen) to our planet?

7.what you (wish)if a fairy (give) you three wishes?

8.if i (know) his telephone number,i'd give it to you

9.if i had a type writes i (type)it myself

10.he might get fat if he (stop)smoking

Câu 1:lập CTHH của hợp chất có tỉ lệ khối lượng các nguyên tố Ca,S,O tương ứng là 5:4:2

Câu 2:Một chất đc tạo bởi kim loại M (I)và O ,trong đó O chiếm 20% về khối lượng .M là kim loại gì?viết CTHH của chất này