There’s someone knocking on the door. Who _____itbe— Itmust be Mary. She promised to be here at 8：00.

He needs_______ breakfast every day.

His success in his career was due to hisdetermination __________ what seemed impossible.

We’d better hurry or we’ll be late—_____ Do you really want to listen tothe boring lecture

I like ____ in the autumn when the weatheris clear and bright.