I（）to go for a walk, but someone called and I couldn't get away.

单项选择题—What should I wear to attend his wedding party —Dress（）you like.

A. what
B. however
C. whatever
D. how

单项选择题—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job —（）my students have a try

A. Shall
B. Must
C. Will
D. May

单项选择题—What's the matter with you —After the long walk, my leg ______ and I couldn't go any further.

单项选择题Many people keep dogs as pets because dogs are regarded as（）friends to people.

A. lonely
B. only
C. loyal
D. fair

单项选择题Friendship helps us understand ______ we are, ______ we need each other and ______ we can do for each other.