—Do you know Songhua Lake at all? —No, this is the first time I_____ here. [ ]

The young couple had a quarrel last night and neitherof them would give in to ______.

It won’t be easy, but we’ll get across theriver ______.

The United States _______ fifty states , one of which is separated from the others by the Pacific Ocean.

— Sorry. She isn’t at home now.