Do you know the boy _______ under the big tree?
| A．lay | B．lain | C．laying | D．lying |
When she first arrived in China, she wondered what the future might have_______ for her, but now all her worries are gone.
| A．in need | B．in time | C．in preparation | D．in store |
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 |