21. When ____ Brown was born, engaged or married, all ____ Browns were present.
A. / ; the B. the ; / C. a , the D. certain; /
22. ----What makes you stay indoors last week?
----________
A Because I caught a bad cold. B. Because of a bad cold.
C. Bad cold as I had. D. A bad cold.
23. We should do such exercises in the future, I think, _____ we did yesterday.
A. as B. like C. about D. than
