My grandma started using Weibo at the age of 70. She always says it’s never ____ old to start doing things.

— ________ have you become so good at English this term ?—By studying grammar and reading English novels.

________, the Internet was only used by the government. But now it’s widely used in every field.

Some people like wearing fashionable clothes; ______, some birds like bright feathers.

—Have you ___________ been to Beijing? —Yes. But only once.