This machine metal.[ ]

What’s the matter with the little boy?—A bad traffic accident happened _____ him. What a pity![ ]

If you for your favorite TV programs, you will feel sleepy.

Excuse me, is there ________ book by Mo Yan?—Yes. It’s on _________ bookshelf over there.

___________ has always been expected, he has finally achieved his dream, ________ makes his parents so proud.