课时作业(五) [必修1 module 5 a lesson in a lab] (限时：35分钟) ⅰ.单项填空 1．you ________ this, mother. it's no concern of yours. a．keep to b．keep out of c．keep off d．keep up 2．—i probably shouldn't have any more cake. —oh，________. it won't kill you. a. go ahead b. hold on, please c. you're welcome d. that'll do 3．we all eat with plates ________ on our knees. a．to be balanced b．balanced
