Kelly often helps _ with my math.

The students found _______ easy to work out this maths problem.

—What a surprise! Harry used to get nervous because he couldn’t organize his ideas well _________ to express _________ clearly.—Great, havent’t you heard, “Where there is a will, there is a way.” Let’s give him a big hand.

 —Is this your sister’s key, John？ —No, it isn’t. ______ is in the bag.

These books are _____.  _____ are in  _____ bags.