Ⅰ.单项选择
( )1.[2017·自贡]Nancy spoke in such a low voice that ________ in the room could hear her.
A．everybody B．somebody C．nobody
( )2.[2017·武汉改编] Even though we're in difficult times, we need to keep hope ________．
A．real B．alive C．fresh
( )3.[2017·宜昌改编]—The plane won't take off ________ the thick clouds move away.
—Let's wait patiently for the announcement from the airport.
A．since B．until C．while
