——Which of the two English dictionaries will you buy?——I’ll buy ________ of them, so I can give one to my friend Helen.

--- ________ is this pen?       --- It’s white.

I enjoy the popular dance "hip-hop", but ________of my parents likes it.

— What do you think of this math problem?—It’s too easy. _____ in our class can work it out.

Don’t copy others’ work. If you do it by ________, you’ll feel much better.