Someone who lacks staying power and perseverance is unlikely to ___ a good researcher. 
| A．make | B．turn | C．get | D．grow |
Many countries are increasing their use of natural gas, wind and other forms of __________.
| A．energy | B．source | C．power | D．material |
There are plenty of jobs __________ in the western part of the country.
| A．present | B．available | C．precious | D．convenient |
More and more high-rise buildings have been built in big cities __________ space.
| A．in search of | B．in place of | C．for lack of | D．for fear of |
—Ourholiday cost a lot of money.
—Did it? Well, that doesn't matter __________ you enjoyed yourselves.
| A．as long as | B．unless | C．as soon as | D．though |
The retired man donated most of his savings to the school damaged by the earthquake in Yushu，__________ the students to return to their classrooms.
| A．enabling | B．having enabled | C．to enable | D．to have enabled |