A)
1.are laughing
2.is blowing
3.are preparing
4.am talking
b)
1.(отриц) Sorry, i can't understand why you aren't laughing at me.
(вопрос) Sorry, i can't understand why are you laughing at me?
2.(отриц) The wind isn't blowing very strong today.
(вопрос) Is the wind blowing very strong?
3.(отриц)Don't worry them! They aren't preparing for the tomorrow interview.
(вопрос)Don't worry them! Are they preparing for the tomorrow interview?
4.(отриц)I'am not talking to my mom now, I can’t answer the phone.
(вопрос) Am not i talking to my mom now, I can’t answer the phone.