— ______you write so well? —By reading and keeping diaries every day.

 --- Have you really been to visit the Bird’s Nest in Beijing?　   ---- I ______ it last summer vacation.

It was only after he had read the papers    Mr. Gross realized the task before him was extremely difficult to complete.

_______ is not the story itself but the lovely characters in it _______ make children interested in the cartoon.

It was my sister        first had the idea to cycle along the river.