The old professor, to_______ the important invention _______, decided not to keep it for himself, but to make it known to all over the world.

It was really _____ of your brother not to play the guitar while you were preparing your lessons.

call you ______ I arrive in Shenzhen—Thanks, and good luck

______ great fun it is to have a swim in such a hot day!

Look! Some boys ______ soccer there.