---Someone’s been here. Who ___ it be? It looks like Helen.---It ___ be Helen.She is ill in hospital.
________ of my sisters are experts in agriculture. Helping the farmers improve their farming techniques _________their duty.
________ the Chinese men’s football team with that of North Korea, we can see what the former lacks is spirit and determination.
She ______ your birthday. But she had to put work first.
— It has been dry for a few months. — You’re right. There is twice ____ rain this year than _____ of last year.
— How about your weekend? — Very boring. We could do nothing but ______ for the sky to clear up.