He ________ to swim when he was five.
Every minute about ____ babies are born in the world, so the world’s population is increasing by _____million every year.
Will it be a long time _______ I come for the pictures? —-No. It _______ be ready by
The new bridge in Wenchuan ____ last month. Now it’s easy to go to the city center.
We couldn’t finish our work so early _____ yourhelp.[ ]