Hiking is _________ great fun. You will get close to________ nature and take exercise at the same time.
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.