1. We can see __sun in the day, and we can see ___many stars at night.

A .the, the      B .a, a     

 C .the, /        D./, the                                                                 

2. We often plant _______trees every year.

A. thousand       B. thousand of  

C. thousands of    D. thousands

3. ---Excuse me .Can you give me ________about learning English ?

  ---Certainly .I’m glad to help you.

A. a advice      B. an advice   

C. any advice    D. some advice