15. Could you tell me ____________ to fly from Ha Noi to Ho Chi Minh City?

A. it costs how much                                B. how much does it cost

C. how much it costs                                D. how much costs it

16. My mouth is burning! This is ____________ spicy food that I don’t think I can finish it.

A. such                        B. so                        C. very                        D. too

17. It’s very noisy in the new neighbourhood; ____________, we enjoy living there.

A. therefore                B. but                        C. so                        D. however

18. Don’t ask me to decide. I’m not very good ____________ making decisions.

A. on                        B. at                        C. in                        D. about

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