We want to know whether the drug has an effect _______________ people's health.
E-mail, as well as telephones, _____ an important part in daily comunication.
—I’m thinking of the test tomorrow. I’m afraid I can’t pass the time. — ______ ! I’m sure you’ll make it.
—How long are you staying ? —I don’t know. ______ .
He made up his mind to devote his life ____ pollution _____ happily.
Many people ______ for the Party before liberation.