---Are you writing a letter? ---Yes, _______.
A.I amB.you are C.it is
Thank you _____ telling me about your day .
A.atB.toC.for
---What is your mother doing?
--- _________cooking dinner.
A.she isB.He isC.She is
My grandma likes _________ the room.
A.cleanB.cleaningC.cleans
---Why do you like summer best?
---______ I can swim in the lake.
A.BecauseB.SoC.And