Imperfect goods are ________ by our quality control center in case they come into the consuming of the customers.[ ]

The sign means　_________

Can I help you, boy—Yes. There is ______ wrong with my bike.

I’m afraid I must be going now I ’ 11 come to see you before long ,-I’m afraid I must be going now I ’ 11 come to see you before long

Do you know _______ they got to know each other? —- It was last year_______ they both taught Chinese in Scotland.