—I could believe my eyes when I came to Nanjing last year.—Yes. Great changes have taken place in the past few years.
_______ jeans were invented over 100 years ago, they're still in fashion today.
We _______pay to get into the concert. It's free.
--Good morning, sir! _________?-- I'd like to buy a sweater for my daughter.
You have to be ______ and wait until I finish my work.
--My parents and I will go to London for a trip tomorrow. --Really? __________.