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a) \(4Cr+3O_2\rightarrow2Cr_2O_3\)
b) \(2Cu+O_2\rightarrow2CuO\)
c) \(2Ca+O_2\rightarrow2CaO\)
d) \(4Al+3O_2\rightarrow2Al_2O_3\)
1 . People
2 . Flowers
3. Books
5. The children's blocks
13. False
14. False
15.True
1 people
2 flowers
3book
5 the chidre'sblocks
13 false
14 false
15 true
A beautiful picture taken by the thief.
Dịch : Một bức ảnh đẹp được chụp bởi tên trộm.
Chúc bạn hok tốt !
apartment / door / mine / they / an / to / rented / next .
........Thay rented an apartment next door to mine.................................................................................................
first / saw / shark / time /she / this / the / a / is .
............This is the firs time she saw a new shark..............................................................................................
worte / often / year / letters/ pen pal / to /I/ my last .
................I often worte letters to my pen pal last year.....................................................................................
short / stopped / the / they / at / my restaurant / for / time / a.
...................They stopped at the restaurant for a short time .......................................................................................
bought / made / mother / dress / material / my / and / me / the / a / for .
...............My mother bought the material and make a dress for me .................................................................................
học tốt
1. I know a lot about Beijing because I ...went.......... there last summer
2. Eating fruit and vegetables every day .......is............ very healthy
3. My Brother usually ......goes...... fishing in his free time
4. Jane 's hobby is cooking . She enjoys ...preparing...... food for her family and friends
Chúc bạn học tốt ! ^-^
1. I know a lot about Beijing because I went there last summer
2. Eating fruit and vegetables every day is very healthy
3. My Brother usually goes fishing in his free time
4. Jane 's hobby is cooking . She enjoys preparing food for her family and friends
Chúc bạn hok tốt! ^-^
1.Today Mai doesn't wear uniform .
2.I'm excited at school on first day .
3 .We eat lunch in at lunch time school canteen.
4 .Tomorrow Hoa will buy flowers for her father 's birthday .
5.Nobody in my class is better at Maths than Minh .
1) How often do you play volleyball ?
2) What time do Anne and Betty get to school every day ?
3) How does your father go to work ?
4) When are we going for a holiday by sea again ?
5) Why do you l your coffee ?
1)How often do you play volleyball
2)What time do Anne and Betty get to school eveyday ?
3)How does your father goes to work ?
4) When / How long / Where are we going for a holiday by sea again ?
5)Why do you your coffee?