You can’t be ______ when you camp _____ a high altitude, ________ the air is thin. 

Do remember to be ________. We must avoid any possible risks when doing this dangerous chemical experiment—burns, poisonous gases or cuts from broken tubes.

A young lady _____________ is desirous of meeting with a situation in a private family where the children are under fourteen.

 Be careful not to drop it; it's very ______.

Look！How much________ Alice looks wearing her new show dress!