If you meet trouble, you can ______ your friends ________ help.
My aunt often drops by my house ______ Sunday afternoons because I am free then.
They paid ______ money for the machine than I had expected.
— David, is this your sister’s bike?— No, it’s not ______. It’s my brother’s.
It’s ______ good idea to visit our old teachers on ______ Teachers’ Day.
We will celebrate the 90th birthday of the Chinese Communist Party ____June 29th, 2011 in Qinzhou.