It's impossible________back the wheel of history.
| A．to hold |
| B．holding |
| C．held |
| D．to be held |
Are you ready for Spain?
Yes. 1 want the girls to experience that______they are young.
| A．while | B．until | C．if | D．before |
Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on; at |
If you really have to leave during the meeting, you’d better leave ____ the back door.
| A．for | B．by | C．across | D．out |
Let’s learn to use the problem we are facing ________ a stepping-stone to future success.
| A．to | B．for | C．as | D．by |
The house still needed a lot of work, but _______the kitchen was finished.
| A．instead | B．altogether | C．at once | D．at least |