If it ______for his invitation the other day, I should not be here now.
had not been
should not be
were not to be
should not have been
---What do you think of his talk on Information Technology? ---Oh, excellent. It’s worth_____________.
I like getting up very early in summer. The morning air is so good______.
()____your own needs and styles of communication is as important as learning to convey your affection and emotions.
Drivers are warned that it is dangerous to talk on the phone while________.
Research found that children who drank mainly soda were more than twice as likely as those who drank no soda _________ signs of aggression.