How many of you have solved the math problem— ________, the math problem is far too difficult for us to work out. .

______, I still couldn’t figure out what theheadmaster said at the conference.

I’m not ____ to getting up so early after thevacation.

Our neighbor offered to look after our baby yesterday when we were busy, _____is often the case.

_____she your mother —No, she _______. She’smy aunt.