________ the afternoon of May 12th, 2008, a serious earthquake (地震) happened in Wenchuan, Sichuan Province. [ ]

The book ______he bought yesterday is very interesting. [ ]

Not until I was a senior student_________the importance of English.

Why ____ a notebook with you? I’ve left it at home. [ ]

Excuse me, have you seen _______ umbrella here?— Yes. Is it _______ beautiful blue one? I saw it here just now.