Many students practice _______ in the morning because of the P.E. exam.
run
running
ran
I study for a test _________ working with a group.
A tsunami(海啸) happened in some southern Asian countries________ December, 2004.
Tim’s mum is worried _______ her son’s eyesight as he plays online games too much.
We should return the books to the library ______ time.
________ your help, I can’t get the information about Hawaii easily.