Once you get _______ something, it is very hard to ________.
Could you drive me to the supermarket at noon if _________?
The Chinese ________ fifty-six nationalities, each of whom has their own characteristics.
Jenny hopes that Mr. Smith will suggest a good way to have her written English ______ in a short period.
--- Where did you get to know her?--- It was on the farm _____ we worked.
Food safety is _______ important, so the government spares no effort to prevent food pollution.