18. There was ______ time ______ I hated to go to school.
A. a; that B. a; when C. the; that D. the; when
19. We hadn’t planned to meet. We met _________ chance.
A. of B. in C. for D. by
20. The result of the experiment was every good, ______ we hadn’t expect.
A. when B. that C. which D. what