No bread eaten by man is so sweet as _____ earned by his own labor.
It is a long ___to build a people--centered society in china.
Is it only money ___ brings us happiness?
There is ___ in traveling during National Day with visitors crowded into the scenic spots.
--If we want to study English well, we should do more exercises. --. Practice makes perfect.
Across from the KFC_________a big supermarket whose business is taking off recently.