An appropriate amount of temporary pressure can ______ a kind of motivation to do something well, but once it becomes constant or permanent, psychological problems are likely to _______.
| A．act as; rise | B．play as; appear | C．work as; raise | D．serve as; arise |
The summer holiday is just ____ the corner. How do you plan to spend it?
| A．at | B．around | C．on | D．in |
____ hands and knees Helen Thayer got the tent up.
| A．In | B．At | C．With | D．On |
The woman looks so worried. She seems ____ something valuable.
| A．lose | B．losing | C．to have lost | D．having lost |
For women life sometimes seems ____ it is for men.
| A．twice as hard as | B．as twice hard as | C．as hard twice as | D．as hard as twice |
____ his homework, the boy went out to play games with his friends.
| A．Finished | B．Having finished | C．Being finished | D．To finish |