单选题 Friends might not be always trust-worthy, but dogs are; they have long been regarded as the most( )company of human beings.

单选题 Ecological vehicles are made of materials that can be easily ( )once they are dumped.

单选题 Christmas is not just a()holiday now. People other than Christians also celebrate it.

单选题 There has been a lot of( ) prejudice in American .

单选题 Tom goes to that pub every night to have a bottle of beer. He is a()customer.

单选题 The relations between my mother and brother were getting worse as my brother grew older and more( )

单选题 To keep health, we have to keep () hours.

单选题 He is an incurable idealist; it's unlike to help him come down to earth and be more ( )