The world’s population is getting largerand larger, so scientists will have to ______ new ways to solve food problem.

Can you show me _______ to use this kind of camera-Sorry, I don’t know, _______.

We can’t _________ a plan today. Clean-up Day is only two weeks from now.

______ he used traditional materials, Gaudi was a modern architect

he key to the success of any film isfinding a capable and qualified artistic director, _____ I always hope to be.