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1. A: How often does he speak English? B: Only when he meets an American. A: Do you ever play tennis? B: Sure, when it's not too hot.

A: Ms. Park isn't here yet, is she? B: No, this is strange. She's always on time.

A: Isn't he here yet? B: He's usually late when it rains.

2. The accumulation of knowledge is the source of all wealth.

Austerity is elegance. 4