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16. What do you want to do ......... the weekend?
a. on, b. at, c. in, d. -
17. We've got Biology ....... Monday.
e. in, f. at, g. on, h. -
18.  ......... which day of the week have you got Science?
i. in, j. at, k. - , l. on
19.  School starts .......... 7.30.
m. in, n. at, o. - , p. on
20. A hen is ........... of a barn.
r. behind, s. between, t. in front, u. in
correct answer(s).