The maths problem remained confusing to the boy although __________ over and over.
| A．explaining | B．being explained | C．explained | D．having explained |
You should book a train ticket_____ if you want to go home in time before the Spring Festival.
| A．in return | B．in advance |
| C．in place | D．in order |
A number of graduates prefer to work in big cities , where there are lots of _______, like convenient transportation , more opportunities and better environment.
| A．amusements | B．attractions |
| C．collections | D．achievements |
They are said to have developed a new ______ to teaching ,_______ is bound to improve classroom teaching greatly.
| A．approach; which | B．approach; that |
| C．means; which | D．means; that |
________ of his son’s safety, the father turned off the light and went to bed.
| A．Being convinced | B．Convincing |
| C．Convinced | D．Having convinced |
We are exited that a satellite ________ 10 tons was successfully placed in orbit yesterday.
| A．weighed | B．weighing |
| C．to be weighed | D．being weighed |