单项选择题

Before you submit the form to request your ______ vacation, you need to complete the ongoing project first.

(A) unuse
(B) unused
(C) unusing
(D) unuses
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单项选择题
To get a necessary reference letter for the scholarship, students must contact ______ high schools in advance.
(A) they
(B) them
(C) their
(D) theirs
单项选择题
In some countries, home prices have a tendency to soar ______ as interest rates began to drop.
(A) efficiently
(B) strictly
(C) productively
(D) dramatically
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