Вставьте нужную форму глагола to be:

1)Helen is… my sister.
2)Was… Sam at your party last Saturday?
3)The final tests will be… enough difficult next time.
4)Your new book is… not so interesting as it was… last year.
5)George, are… you a student of Technological University? – Yes, I am… an exchange student.
6)…Will he be… in time here?
7)This street was… repaired last month.
8)Are… they here now?
9)…Is she alone at home?
10)Your smile …is so stupid and inappropriate in this situation.
11)The Shannon is… the biggest Irish river.
12)I will… not be… late to your report.
13)…Is a whale the biggest animal in the world?
14) Tolkien, Chesterton, Lewis were… the most popular British writers last century.
15)…Is High Math your biggest problem for you at the Institute?
16)Oxford is… a city in the South East region of England and the county town of Oxfordshire.
17)Pentagon …is the biggest administrative building in the world.
18)In general it is… very difficult to assemble devices on the atomic scale, as one has to position atoms on other atoms of comparable size and stickiness.
19)Computer revolution will be… the reality of the next one hundred years.
20)Ford Thunderbird of 1960 was… a high-speed sedan with folding top.