选择括号内恰当的单词填入空白处,使句意完整正确。
Lu Xun is known _______ (as/ for) a great writer.
The terrible gas makes people hard to ________ (breath/ breathe).
________ (Once/ Unless) people start taking drugs, it will be hard for them to stop.
The program__________ (offer/ provides) homeless children with house and food.
Most people in China can get good ________ (medicine/ medical) care.