— Do you think yesterday’s math problem was difficult?— Yes. I could work it out.
-______fresh vegetables!- I myself grow them. Go to the balcony, and you can see more.
---Have you heard about the missing of Flight MH 370 _____?---Yes, I have ______ watched some news on TV.
The Greens used to live in London and now they ______ in Beijing.
The new supermarket ________ since last December .
My father ______ my mother when they were both 26 years old, and they have ______ for 15 years.