短语填空
So it will be very difficult for us __________ ( 领先 ) in this competition .
We _______( 呼吁) South Africans not to do this many times , but it doesn’t work .
________ ( 把目光从…移开)the screen about every 20 minutes and stare at a distant object for several seconds to relax your eyes .
Exchange opinions with your parents frequently so you can ____(和… 关系好) each other .
They  ____________ ( 对…感到羞耻) their treatment of the black in the 19^th century .