When I was a child, I ______ watch TV whenever I wanted to.
If it is convenient ____you , I want to ask you to help me repair the roof of the kitchen. on Friday . A. to B. for C. with D at
__________ there was danger ahead, the girl walked on.
The population of China is _______ than that of America.
_________ it is to have a picnic !
Mr. Smith was _______ of the _________ speech.