It is generally believed that _____ study, we can gain both knowledge and skills

Fever is a ________of many illnesses. So I suggest youtake it seriously and see a doctor as soon as possible.

ust four years _______, the Brazil Olympicorganizers have promised to deliver an equally inspirational ceremony.

When is your father going to Hong Kong—He is going there July 28th.

“A ______ accident happened at 7:30 a.m.”said the policeman _______.