—How long _______it _______ you to work out such a difficult problem? —About thirty minutes. A. did… take B. does… take C. did…cost
Lots of trees ________in our city over the years. It is becoming greener and greener!
— What _______ do you have for Daniel? — I think he should study harder than before.
I found there was only one copy of “Bighead Son and Small-head Father” on the bookshelf, so I decided to buy _______ at once.
Lin Shuhao, now _______ NBA star, used to be a student of the Harvard University.
---I’ll take part in the Writing Competition next week. I’m afraid I can’t do very well.---________!