They urged that the library_______ open during the vacation.
| A．must be kept | B．is kept |
| C．would be kept | D．be kept |
He’s worked there since the shop opened in 1998, _____ ?
| A．isn’t he | B．hasn’t he |
| C．doesn’t he | D．wasn’t he |
She will have a holiday as soon as she _____ the work next week.
| A．finished | B．will finish |
| C．finish | D．finishes |
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 |