23. If silver more scarce than gold, it will no doubt have a greater value. (A) becomes (B) became (C) had become (D) will become

30. She’s very creative; , she designed the stage set for the community opera last month. (A) however (B) for example (C) in other words (D) on the other hand IV、第 31 至第 40 題，每題各有一個空格，並各附有四個選項，請依據文意與語法，選出最適當的答案，以完成該句或該短文。