—What do you think of the book?—Oh,excellent.It’s well worth _________time.
The heat in the desert is__________; therefore there are few plants growing there.
I am sorry to say that our food is almost______. We cannot survive if there is no one to help us.
When the baby was crying, she started singing to him and was_______ with a smile.
Only______ people can have a good understanding of the lecture given by the scientist.
I_______ laughing when my son made a face.