Is this school ______ they visited the other day?
This is one of the happiest days ____ spent in my life.
---I _____ to a party, but I’ve got nothing to wear. --- Why don’t you have a dress made for the party?
This book _____ ten units, ______ three mainly revision.
A completely new situation is likely to when the new law comes into effect.
The computer, help we human beings have stepped into the information age, should be regarded as one of the most important inventions in the 20th century.