You can usually quite well without knowing the exact meaning of each word.
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.
— I’d like to invite you to our party this weekend.— Thank you, but _________I’ll have time I’m not sure at the moment.