Scientists have shown that there is a connection ____ cigarette smoking and certain diseases.
—Is Jack on duty today? —It __________ be him. It’s his turn tomorrow.
As you worked late yesterday, you __________ have come this morning.
— Must he come to sign this paper himself? — Yes, he __________.
If it were not for the fact that she __________ sing, I would invite her to the party.
— What’s the name? — Khulaifi. __________ I spell that for you?