There’s an old saying ____ goes, “An apple a day keeps the doctor away.” This is especially true in the US, ____ apples are a huge part of food culture.

Has anything _________ wrong with your car?

I’d love to go to the party with you tonight.— Oh, I’m sorry, there be a party because of the coming exam. [ ]

What qualities does a person need to become an astronaut?—He ________be knowledgeable，independent and creative.

Chinese President Xi Jinping made a speech at the 4th Nuclear Security Summit ______ March， 2016.