What are you doing?—I’m putting the picture _____ the wall. [ ]

Today Chinese ______ by more and more people all over the world.

A: Listen! Is it Tina singing in the next room?B: No, it __________ be her. She is still in Shanghai.

Who will _______ the baby when your aunt is away?—Nobody but me.

________，he never seems able to do the work beautifully.