Only when Lily walked into the office ______ that she had left the contract at home.
| A．she realized | B．has she realized |
| C．she has realized | D．did she realize |
On many trains and buses, there are some special seats ________ out for senior citizens.
| A．marking | B．marked | C．to mark | D．mark |
The number of foreigners that ________ to Huaihua ________still increasing.
| A．come; is | B．comes; is | C．come; are | D．comes; are |
After school we went to the reading-room to do some reading, only to be told that it .
| A．is decorated | B．was decorated | C．was being decorated | D．is being decorated |
I set up e-mail addresses for my mum and dad ________ I could e-mail them regularly.
| A．now that | B．even if | C．so that | D．As though |
People just wonder ________ that makes the housing price so high.
| A．what it is | B．what is it | C．why it does | D．Why does it |