Выберите правильную степень сравнения прилагательного

1.Which animal is the fastest: A kangaroo, a horse, a cheetah?
2.Which language is most widely spoken: English, French, Chinese?
3.Which river is the longest: the Nile, the Volga, the Mississippi?
4.Which ocean is the biggest:the Arctic Ocean,the Atlantic Ocean,the Pacific Ocean?
5.Which building is the oldest:he Tower of London,St Paul's Cathedral,the National Gallery?
6,Which car is the most expensive: a Volga,a Ford,a Rolls-Royce?
7.Which part of English is most difficult to you: English grammar,English pronunciation,English spelling?
8.Which country is the coldest and which country is the warmest:Italy,Norway,Germany ?
9.Which city is the most populated:Moscow,St Petersburg,Tula?
10.Which climate is the healthiest: a hot climate,a cold climate,a mild climate?

C B заданием не могу

This book was writing by a famous Russian writer in the 19th century.

He said that he visited this country some years ago.

If you called me today, I would have time to explain you the situation.

We want invite you to our celebration.

He said that he will do his homework after he has had dinner.

Ann enjoys talking on the phone.

Do you mind my open the window?

I will fly to London next week.

When we saw him he ate a sandwich which he bought in MacDonald’s.

If you tell me about it earlier, I will cancel my visit.

I going to work this weekend.

She never forgot her duties.

The test will check by next Friday.

This cake sell everywhere.

We sent this message to all the members of the group two days ago.