Had it been possible I would have gone to the movies,but I _______ busy.

y a meteorological observatory _____ air quality in urban areas from one to five:excellent, fairly good, slightly polluted, poor, and dangerous.

Hi! Where are you going See what the sign _________ —-Sorry, I _________ it.

With time going by, we have come to realize that creativity is _______it takes to keep a nation highly competitive.

依次填入下列各句横线上的词语，最恰当的一组是（ ）（3分）①劳动合同是劳动者与用人单位之间 劳动关系，明确双方权力和义务的协议。②这几项职工福利待遇规定，是全厂职工代表大会 的，任何人无权随意改动。③单纯追求升学率， 了学生的负担，影响了学生的身心健康。