Откройте скобки, употребив правильную временную форму глаголов

1.The Volga, the Dnieper and the Neva _____ (to be) famous rivers.2.At the moment we ___________ (to do) an exercise on articles.3.Yesterday at about 11 o’clock he ________ (to walk) to Fleed Street.4.If he ________ (to come) at 5 o’clock, ask him to wait.5.I ________ (to be) in Moscow tomorrow morning.6.Where is Nick? He ____ just _____ (to go out).7.It __________ (to snow) now. Yes, it ___________ (to snow) very hard. You can’t go out yet.8.My sister ______ (to have) a good appitite and she always ______ (to eat) much.9.He _____________ (to wait) until they send for him.10.______ you ever ______ (to be) to the Tretyakov Gallery?11.____ you ______ (to go) to see him yesterday yourself? Yes, I _______.12.My little sister _____________ (not to be) to a zoo before.13.Tomorrow I ____________ (to apologize) to him.14.I knew Sarah was very busy, so I ______________ (to disturb) her.15.Suzanne ______already ________ (to have) a baby.