A.I want a kilo of pears. B.You can do in your own way. C.Thanks. D.Excuseme.I’m busy.
单项选择题She's part of a team of scientists who are（）upon cancer research.
A.worked B.arranged C.engaged D.involved
单项选择题Tourism has（）agriculture as the nation's main industry.
A.recalled B.reckoned C.redirected D.replaced
单项选择题I cannot tell the（）difference between the twins.
A.slender B.slight C.single D.simple
单项选择题This is the dictionary（）I depend a lot whenever I have problems with new words.
A.on which B.in which C.for hich D.with which
单项选择题It's no use（）with him
A.toargue B.（in）arguing C.argue D.argued
单项选择题He is over fifty, but he looks as if he（）only in his thirties.
A.is B.were C.will be D.has been
单项选择题Is there any reason（）you should go away?
A.why B.that C.where D.as
单项选择题Such changes can alter the social structure,（）people to move.
A.leading B.which led C.leads D.which leading
单项选择题Cycling is a good exercise.（）, it doesn't pollute the air.
A.Therefore B.However C.Moreover D.But
单项选择题They were asked to avoid（）any water which had not been boiled.
A.drinking B.not to be drunk C.to drink D.having
