---__________ is the most difficult of all the lessons.--- I agree. But it’s the most interesting.

— The dictionary is a useful                      for understanding new words. — I think so.

Either Eve or Herb ___________ been invited by Lucy’s parents already.

There is________ milk in the bottle. Let’s go and buy some.

- New York is a wonderful place to live .-But many people        to buy a house to live in.