If it ________ for the heavy rain then, we would have arrived here ahead of time.
— Excuse me, can you show me the way to the nearest bus stop?— Sorry. I’m a stranger here. I ______ here until my guide arrives.
When Mary arrived she found all her children ______ for nearly two hours.
The silence of the library ______only by the sound of pages being turned over.
President Xi has advised young people to avoid staying up late, ______ heated response from Internet users on microblog.
Although nuclear power may lead to disasters, ______ the nuclear power industry has been operating safely for three decades in China.