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
Leaves are found on all kinds of trees, but they differ greatly size and shape.
A. on B. from C. by D. in
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
