21. --- Sally, was ________ problem solved?
--- We were trying to think of ________ way out, but it was hard to find one.
A. the; a B. a; a C. a; the D. the; the
22. John didn’t choose of the ties and went away without looking at a third one.
A. many B. either C. all D. any
23. When I finally got up to leave, we both knew that a real friendship ________ between us.
A. have formed B. will form
C. is to form D. was to form