The strange-looking museum, _______ in the early 20th century, attracts about a million visitors from all over the world every year.
_____ do you think will teach us math next term?
. The reason why I have to go is _____ if I don’t.
_____ I accept the gift or refuse it is none of your business.
_____ we need more practice is quite clear.
_________, what you did is right. So don’t be worried about it any more.