What do you think of the boy—He ______ a great kid ever since he was born, always quiet and friendly.

I don’t doubt ________ he’ll come.

Please turn off the radio, grandma___now.—OK, I’ll do it right now.

The aim of the trial operation of Shanghai Expo was to _______ problems, if any, so that the organizers could make changes accordingly.

More than 100 students have entered for thecompetition and_______ gains the most points will be the winner.