A.at….of…on | B.at….to …of | C.at…on…of | D.at….to…on |
A.drop in at | B.drop in | C.drop on | D.drop in on |
A.above…in | B.below…to | C.under….at | D.over….by |
A.from standing | B.of the standing | C.with standing | D.to stand |
A.for | B.about | C.on | D.with |
A.since | B.in | C.before | D.after |
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