ternet isa wonderful discovery,________of great significance to people’s lives

－Could you tell me________ yesterday－I went bike riding with my classmates.

Do you know who invented the telephone—-No,I only know it in 1876.

I have finished translating a large part of the book, but the rest ___ more difficult.

I can never afford a new house likethat!— ________ . The price is too high.