Someone who lacks staying power and perseverance is unlikely to _________ a good researcher．
| A．make | B．turn | C．get | D．grow |
Facing this ________ problem, I found myself ________ about how to work it out.
| A．puzzled; puzzled | B．puzzled; puzzling |
| C．puzzling; puzzling | D．puzzling; puzzled |
________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
| A．While | B．As | C．Because | D．If |
When I saw Jane, I stopped and smiled, but she ________ me and walked on.
| A．refused | B．ignored | C．avoided | D．Missed |
With the advanced technology, our factory produces ________cars as we did last year.
| A．as twice many | B．many as twice | C．twice as many | D．as twice as many |
There is no point ________ time ________ with him.
| A．to spend; to argue | B．in spending; arguing |
| C．to spend; arguing | D．in spending; to argue |