You shouldn’t stay at home all the time. You’d better go out and relax now and then, ______

_____ by keeping down costs will Power Data hold its advantage over other companies [ ]

You really need to go out and get some fresh air and sunshine．You ___overworkedduring the last two weeks

You will succeed in the end ________ you give up halfway.

Mary, let’s go to the bookshop this weekend. Will you be —Sorry, but I’m going to visit my uncle in the countryside.