Is this factory _____ you visited the other day？
| A．the one | B．that | C．where | D．when |
The world _____ . Things never stay the same.
| A．had changed | B．is changing |
| C．was changing | D．will change |
Could you tell me when to get the book _____ I want to read?
| A．what | B．who | C．/ | D．it |
The math problem is so hard. I really don’t know _____.
| A．what to do it | B．how to do |
| C．how to do it | D．what do it |
She told us _____ story that we all forget about the time.
| A．such an interesting | B．such interesting a |
| C．so an interesting | D．a so interesting |
At that time, Tom was _____one-year-old baby.
| A．a | B．an | C．the | D．/ |