I’ve already forgotten you bought the dictionary.
| A．that it was when | B．that was it when |
| C．when was it that | D．when it was that |
You can not use the machine today because some parts __________ this week.
| A．are replaced |
| B．are being replaced |
| C．have replaced |
| D．are replacing |
Many of us love traveling, but lack of financial __________ often holds us back from seeing the world.
| A．destination |
| B．breakthrough |
| C．support |
| D．request |
__________ the website of the Fire Department in your city, and you will learn a lot about firefighting.
| A．Having searched |
| B．To search |
| C．Searching |
| D．Search |
This is one of the experiments __________ in our laboratory.
| A．being made |
| B．making |
| C．to make |
| D．having made |
As we all know，__________ Siberian tiger is __________ endangered species.
| A．/；an |
| B．the; the |
| C．a; / |
| D．the; an |