用所给词的适当形式填空

小题1:－Do you think you have made a wrong  _________________ (decide) ?

－I’m afraid so. She is so young and she’s never lived alone.

小题2:Usually before exams, the students  __________ (give) two minutes to write down their names.

小题3:He is lazy enough _______________ (sleep) all day without moving .

小题4:We should work _____ (close) with UNICEF to help build a better world for everyone.

小题5:It’s impolite to make too much noise while __________(eat).

基准物质可用于直接配制标准溶液，也可用于标定溶液的浓度。( )