Operation rooms should be kept free ______ bacteria of any kind

mith is a kind person I like to towork with him” “In fact, everyone _______”

I must make full use of the time ___left to me and do as much as I can for the people

I didn’t mean________anything，but those apples looked so good that I couldn’t help________one

Their performance was great success. The audience couldn’t help clapping their hands.