---Lucy, is maths difficult to learn in a foreign school?---I’m not sure, but no subject can be learned well __________hard work.
The left-behind kids(留守儿童)can’t see their parents __________ the parents come back home from work.
–Excuse me, could you please tell me __________ ? –Yes, there is a history museum.
— Stop water running after you wash hands. — _______.
The rich man _________ the poor families _________ much food after the earthquake(地震).
Now the Chinese government has made laws ________ all bad things in Zhalong.