—How is your recent trip to Sichuan?—I've never had ________one before.(2011·四川)

With the help of the new equipment, our factory produced ________ VCD players in 2001 as the year before.

The police are________to conclude that the cause of fire had been a cigarette end.

His girl friend wore a         smile when seeing the nice dress she wanted.

Jack has made great achievements in his work, and the harder he works, the more _________ he becomes.