I think it's well worth ______ our best to learn a second language well.
| A．to try | B．trying | C．try | D．tries |
Lucy knew nothing about it ___________her sister told her.
| A．because | B．until |
| C．if | D．after |
He can play tennis better than ___________in the class.
| A．any boys | B．any other boy |
| C．any boy | D．any other |
The old man lives ___________, but he never feels ___________.
| A．alone; lonely | B．lonely; alone |
| C．lonely; lonely | D．alone; alone |
— Do you know mother giant pandas have only one or two babies ___________?
—Sorry, I don’t know.
| A．at a time | B．at time |
| C．at times | D．at that time |
—Is this maths problem ___________?
—Yes, I can work it out ___________.
| A．easy ; easy | B．easily ; easily |
| C．easily ; easy | D．easy; easily |