—What should we pay more attention to if we go out for a mountain camp. —Nothing special. Take a special pair of glasses ______the wind there is strong and cold.

You’d better do ___ I told you.

_I had just started back for the house to change my clothes_______I heard voices.

I recorded the professor’s speech on my cellphone _____ I could listen to it several times later.

_____ the old man’s sons wanted to know was ____ the gold had been hidden.