— Have you found your English book?
— I am not sure ____ I could have left it.
| A．whether | B．what | C．when | D．where |
—Are you still mad at her? —Not really ，but I can’t that her remarks hurt me.
| A．deny | B．refuse | C．reject | D．decline |
John had planned to make a compromise，but he changed his mind at the last minute.
| A．anyhow | B．otherwise | C．therefore | D．somehow |
At your company there are a few machines similar to described in this magazine.
| A．these | B．them | C．those | D．ones |
I really can’t thank you enough， sir. —.
| A．That’s the most I could do | B．I’m glad to have been of help |
| C．No problem | D．With pleasure |
IP addresses are the unique sequence of numbers ______ to each computer, websites or other Internet-connected devices.
| A．to assign | B．assigning | C．assigned | D．being assigned |