_____ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |
— I don’t know whether I should go abroad or not, Mum.
— I leave _______ to your own judgment whether you should do it.
| A．that | B．it |
| C．this | D．what |
It used to be thought _____ the Earth was flat.
| A．as | B．when |
| C．since | D．that |
Energy is ____ makes one work.
| A．what | B．something |
| C．anything | D．that |
The train leaves at 6:00 p.m. So I have to be at the station _______5:40 p.m. at the latest.
| A．until | B．after |
| C．around | D．by |
They promise that the work would all be finished _____ next week.
| A．until | B．in |
| C．by | D．to |