1. 半岛   strait   oasis   reef   peninsula   Hint Half-n-half Clue   2. 礁石   reef   country   mountain   cape   Half-n-half Clue   3. 谷   valley   country   oasis   city, town   Half-n-half Clue   4. 绿洲   country   lake   lagoon   oasis   Half-n-half Clue   5. 大陆   continent   peninsula   sea   reef   Half-n-half Clue   6. 山   plain   oasis   peninsula   mountain   Half-n-half Clue   7. 平原   city, town   plain   reef   sea   Half-n-half Clue