The thought ______he might be a scientist some day encouraged him to study hard.
| A．whether | B．that | C．how | D．why |
There are so many beautiful cars________, but he is at a loss which to buy.
| A．to be chosen | B．to choose from | C．to choose | D．for choosing |
Under no circumstancesto the teacher.
| A．is this the first time he has lied | B．this is the first time he has lied |
| C．is this the first time has he lied | D．this is the first time he is lying |
With Shanghai World Expo drawing near, volunteers are making use of every minute to ____ their foreign language because language volunteers must pass a written test and an interview.
| A．polish up | B．take up | C．use up | D．make up |
As the visiting prime minister puts, China’s influence in the world will continue to strengthen ______ its economy grows.
| A．although | B．until | C．as | D．before |
With the effects of global warming, trees their leaves much later in the year.
| A．are losing | B．have lost | C．lost | D．were losing |