dap an la ong gia noel

1. I didn’t here you ___ in. You must have been very quiet 
A. Coming    B. To come
C. Came.       D. Have come
2. What would happen if our environment ___?
A. was polluting      B. were polluted
C. is polluted.           D. Is being polluted
3. Bill asked where _____ from?
A. do I came.        B. I come 
C. did I come.       D. I came
4. Jane is hurry ____ miss the first bus
A. not to.           B. in order that
C. in order not to.    D. so as to not

II. Use the following set of words and phrases to complete the following sentences. You can put additional words and make any changes necessary.  

1. Tony / often / play soccer / fall / but / sometimes / sailing.

2. She / live / house / beautiful flowers garden / front / it.

3. How much / beef / you / want /? 

4. I / not / want / eat anything / because / not / hungry.

5. Thuy/ not/ visit/ her grandparents/ next summer vacation/ but/ she/ visit/ her friend/ London.

Số gam chất tan có trong 20gam dung dịch NaCl 10% là:

A. 4 gam

B, 3gam

C, 2gam

D, 5gam