It’s ten years since the scientist _______to discoverthe valuable chemical.

Students can ________ knowledge from teachers and books.

The mobile phone text messages are one of the keycommunication styles now regular letters.

In the new season, the Lakers ____ beat the Rockets 12-110 in last night’s thrilling game with Yao Ming scoring 9 points[ ]

It was at 10 o’clock last night __________ the visitors finally arrived at Pudong International Airport.