The manager has ______ to improve the working condition in the company.

Traveling abroad _____________ to rich tourists and wealthy business people decades ago.

Evidence has been found through years of study __________ children’s early sleeping problems are likely to continue when they grow up.

You’ll never guess who I met today — my old teacher! We _____ for 20 years

What do you think of your boss—He always work hard and he is ____________ late forwork.