Japanese Kanji test for advanced students (1)?

Question

Please translate these sentences into English and replace these katakana letters (ジョウ) with correct Kanji characters.

Q1. 土ジョウが汚染された。

Q2. 人口過ジョウで食料が不足する。

Q3. 汚水をジョウ化して流す。

Answer 1

土ジョウ→ドジョウ　　　　人口過ジョウ→人口増加？　　　汚水をジョウ化→浄化

Answer 2

I take a crack.

Q1. 壌

土壌が汚染された。

"The soil has been contaminated (polluted/tainted)."

Q2. 剰

人口過剰で食料が不足する。

"Food supplies are insufficient because of (the problem of) overpopulation."

Q3. 浄

汚水を浄化して流す。

"Unclean (dirty/contaminated/tainted) water is (will be) purified and then drained (empty/flowed out).

These look like Kanken (Kanji Kentei) questions. Are you studying for one of them? I already passed level 2 and am thinking of going for pre-level 1.

Answer 3

1 土壌　２過剰　３浄化

１Intoxicated soil 2Over population cause food-lucking 3Clean up duty-water and throw away

Is it enough ????