One way to understand thousands of new words in gain _____good knowledge of basic word formation.
_____ prevent her from going to the party, he pretended to be ill ______.
He said while ______ in the countryside, he ______ a lot of hardships and of course learned a lot.
Li Ming is a student who is easy ___ though he has some trouble ____ his lessons.
It was in 2008 ______ a terrible earthquake hit Wenchuan, Sichuan Province.
The system has been designed to give students quick and easy ______ to the digital resources of the library.