_____ seen smoking here will be fined.
| A．Who | B．Whoever | C．Anyone | D．Who ever |
— 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.
| A．stand | B．have stood |
| C．am standing | D．will stand |
When Mary arrived she found all her children ______ for nearly two hours.
| A．have gone to sleep | B．fell asleep |
| C．was falling asleep | D．had been asleep |
The silence of the library ______only by the sound of pages being turned over.
| A．had been broken | B．breaks |
| C．broke | D．was broken |
President Xi has advised young people to avoid staying up late, ______ heated response from Internet users on microblog.
| A．having drawn | B．drawing |
| C．to draw | D．Drawn |
Although nuclear power may lead to disasters, ______ the nuclear power industry has been operating safely for three decades in China.
| A．and | B．but | C．so | D．yet |