Answers:

Sentence 1: 

  They can't call me because they don't know my new telephone number.

Sentence 2:

   It is going to rain. As soon as the rain isn't stopping. I will walk downtown.

Sentence 3:

  What's your sister doing now ?

- She is cooking dinner in the kitchen.

Sentence 4:

  We won't go camping next week. We will visit the museum.

Sentence 5:

  The moon goes around the earth

Sentence 6:

  It snows here in the winter.

@Gaumatyuki#

Câu 1: don't know

Câu 2: will / won' t stop

Câu 3: câu này thiếu is ha gì ấy

=> What is your sister doing now ?

- She is cooking

Câu 4: aren't going to / are going to visit 

Câu 5: Goes

Câu 6: snows