you have tried yourself can you learn what an exciting game it is!
| A．Only if | B．Even if | C．If only | D．As if |
If _____ to look after luggage for someone else, inform the police at once.
| A．asked | B．to ask | C．asking | D．having asked |
The sun began to rise in the sky, ________ the mountain in golden light.
| A．bathed | B．bathing | C．to have bathed | D．have bathed |
You cannot accept an opinion ________ to you unless it is based on facts.
| A．offering | B．to offer | C．having offered | D．offered |
（2013·湖南卷) ________ warm at night, I would fill the woodstove, then set my alarm clock for midnight so I could refill it.
| A．Staying | B．Stayed | C．To stay | D．Stay |
（2013·北京卷) the course very difficult, she decided to move to a lower level.
| A．Find | B．Finding | C．To find | D．Found |