To be going to or will?

A:We don't have any bread.

B. I know.I ................some bread in the shop

• am going to buy

• will buy

A: Why do you take my suitcase?

B: I ............... my mother in Scotland next week

• am going to visit

• will visit

A: I am really cold.

B: I............. take you some hot water

• am goint to take

• will take

A: The phone is ringing

B: I ............. it

• am going to answer

• will answer

A: Are you busy tomorrow?Would you like to drink some coffee?

B: Sorry. I ........ to the library

• am going to go

• will go

A: Why are you carryinng a hammer?

B: I............. some pictures on the wall

• am going to hang

• will hang

Mum: I told you to clean up you room.

Son: Sorry,mum.I forgot.I didn't mean to. I ............. it after lunch

• am going to do

• will do