The math problem seems very easy, but in fact it is very difficult_______.
| A．to work out | B．being worked out | C．working out | D．to be worked out. |
_________ to 100℃, water will boil.
| A．Being heated | B．Heated | C．Heating | D．To heat |
The traffic is heavy these days. I ________ arrive a bit late, so could you save me a place?
| A．can’t | B．must | C．need | D．may |
The consequences of our actions are unbelievably complicated and diverse _______ predicting the future is a very difficult business indeed.
| A．because | B．even if | C．in order that | D．so that |
The Internet has made it possible ______ in a very convenient way around the world.
| A．for people to communicate | B．for people communicating |
| C．for people communicate | D．for people to be communicated |
On the chairs _________ , who had come to Dalian looking for jobs.
| A．three young men sat | B．sat three young men |
| C．did three young men sit | D．three young men sitting |