题目

选词填空。【1】The school bag is so heavy. It is __________ (full / filled) with books.【2】He drank some tea at midnight so he had trouble __________ (fall / falling) asleep.【3】When the sun shines __________ (bright / brightly), it makes me __________ (happy / happily) again.【4】When I am feeling sad, these colors cheer me __________ (on / up).【5】It’s the weekend. The supermarket is crowded __________ (on / with) people.一天晚上，小伟帮妈妈清洗茶杯，三个茶杯只有花色不同，其中一个无盖（如图），突然停电了，小伟只好把杯盖与茶杯随机地搭配在一起，则花色完全搭配正确的概率是    ．