We were swimming in the lake _____ suddenly the storm started.
| A．when | B．while | C．until | D．before |
There __________ a small quantity of water left in the bottle and there are __________ apples in the basket.
| A．is; a large amount of |
| B．are; a great deal of |
| C．is; quantities of |
| D．are; quantity of |
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 |