If only I 　　to my parents advice.

What a pity! Considering his ability and experience, he ____ better.

---Look! The clouds are gathering. ---Yes. I’m afraid it    be pouring down soon.

— Shall I go and buy two more bottles of beer?— No, I’ve already bought twenty. That _____ be enough for us two.

一What does the sign over there read?一“No person ______ smoke or carry a lighted cigarette, cigar or pipe in this area.”