13. He can’t ______ any new jobs at this time. He already has more than he can do.
Jumping out of ______airplane at ten thousand feet is quite _____exciting experience.
What they need ______ enough money, while what we need ______ enough workers.
—Please tell Nana she has won the first prize in the teaching skill contest in April. —_________! She never did so well before.
The serious situation made it possible for laws preventing pollutions_________in many countries.
—Mr.Smith,you are wanted on the phone. —Thank you. _________no one knows I’m here.