Mr. Smith, who often helped passers-by repair their bikes, said that what he did was not paid but _______.

Most Brazilians get along well with each other， _________ they are from different races(种族)， including Americans， European settlers， and Africans，.

More money will be to enjoy more convenience. [ ]

There is a new problem involved in thepopularity of private cars________road conditions need________.

Jessica is very bright and studies very hard _____.—No wonder she always gets the first place in the examination