（ ）1. ---You’ve dropped _____ “s’’ in the word “across’’.
---Oh, ____ letter “s’’ should be doubled like this “across’’.
A. a, a B. an, a C. an, the D. the, the
（ ）2. ---May I ______ your dictionary for a while?
---Sorry, I’ve left it at home.
A. borrow B. lend C. keep D. take
（ ）3. Those_____ have caught SARS disease must be kept off from us.
A. who B. which C. / D. what
