PTK(canxicacbonat)=40+12+3.16+100

subjects: history, computer science, math, physics, literature,biology

things: atlas, calculator, marble, bell, ball, earphones, guitar

activities: catch, skip rope, basketball, blindman's buff, soccer

1.how long have you attended in your school

2.How many people has Ms.Nha Thanh made friend with?

3.what has Harvey done for his parents?

4.how much time have they worked on their reports?

5.which cities has OLlivia visited since 2004

1d   2a   3c    4d   5c   6b   7d   8a   9d  10d

a.AgCl

b.ZnSO4

c.Ca3(PO4)2

d.MgCO3

1.this city center was built in 1990

2.I wish he came to the party

3.he said this exercise was difficult

4.she asked me if I went to school by bike

5.the interviewer asked me why I learned English

the last time i played volleyball was a student

1.will have

2.wears

3.will you meet

4.run

5.doesnt drink

6.reading-playing

7.to go

8.dont work

9.dont want

10.does Tony do

he does

1.drinks

2.does she like

3.doesnt

4.visit

5.go

6.do your parents come

7.do you want

8.dont

d