Game：Shopping center

（明報製圖）

【明報專訊】Pat fell asleep while she was waiting for Bill and MoMo in the shopping center. When she woke up, she found that the shopping center was already closed. She needs to answer the following question in order to open the lock! Help her!

◆Which number should replace the question mark?

(See the picture)

(Answer on next text)

[Smarties' Power English 第308期]