I love music, and _____ father often takes me to the concert. 

I think         necessary to do some running in the morning.

--Is this your e-book? ---No, ________ is on the teacher’s desk.

－Are the keys yours?－No, they aren’t _____. I think they’re Jason’s.

—Are these gloves ________, Betty?—No, they aren't. My gloves are here.