If you want to find some information about a foreign country, you can ask your friends _______ have been to that country.
Because of the poor harvest, wheat prices have _____ in the last six months.
I can't advise you what to do. You must use your own _____.
Tell your brother to come _____, because it's going to rain in a minute or two.
A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
This year the farmers were just able to gather in the _____ before the fine weather came to an end.