Chris is very clever and never wastes any time doinguseless things．—No _______ he always comes first in the examinations

_______ is this pencil —It’s mine.

I_________ longer this morning, but I had to get up and come to class.

wice, the postman refused to deliverour letters unless we chained our dog.

Parents should pay attention to the cases _______ their children have difficulty adapting to new surroundings.