Will you be ____ this afternoon , John?—-It depends. I’ m afraid I’ll be called in by my boss.

The international situation is currently undergoing great changes ______ UNESCO plays an irreplaceable role in promoting international cooperation.

We’re expecting Jerry because he’s our_________ visitor who comes here for holiday every summer

Mary, we left you in _______charge of the room, but now it’s in________ mess!

This book is worth _____.