It’s _________ hard problem for the twins that ________ of them can work it out .
— Who is your favorite writer?— Mo Yan. I like writers _________ tell stories well.
Tom finds _________ difficult to learn Chinese well.
—What _______ you do if you _______ 5 million yuan?— I’d travel around the world.
It’s cold outside. You need to _______ your sweater before you go out.
—Tom, how do you practice your spoken English?— Oh, I do it reading aloud every morning.