______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
| A．To wait | B．Have waited |
| C．Having waited | D．To have waited |
By the time Dave reached the small boat, a thick white fog _______ over the surface of the water.
| A．spread | B．has spread |
| C．had spread | D．was spreading |
At the root of volunteering is the idea ________ one person may have the ability to offer services that can help other people.
| A．that | B．what | C．which | D．/ |
While many people are excited about these new technologies, these same technologies frighten others. Nowhere __________ truer than with genetically modified (GM) food.
| A．there is | B．is there |
| C．is this | D．this is |
I talked to my friend about it, and he’s __________ giving up the plan.
| A．in search of | B．regardless of |
| C．in agreement of | D．in favor of |
Instead of telling the joke he had planned, Crystal _________ a new one.
| A．come up | B．took up |
| C．made up | D．cut up |