You mean I was absent? No! I ______at noon and I have been in the office since.
| A．came back | B．have come back |
| C．was back | D．have been back |
Well, I really don’t know what you mean, ______ you want me to do?
| A．what it is that | B．what is it that |
| C．how it is that | D．how is it that |
Thank you for your hard work last week. I don’t think we _______ it without you.
| A．could have managed | B．can manage |
| C．managed | D．could manage |
Suddenly a good idea occurred to her, but she couldn’t find any paper ______.
| A．to write | B．to write on |
| C．written | D．writing on |
Thailand has decided to begin building its first standard-gauge railways in cooperation with China, ______may cost $12.2 billion.
| A．when | B．that | C．it | D．which |