Tom gave Helen an apple in exchange for a piece of cake.
| A．交换 | B．改变 |
| C．娱乐 | D．教育 |
As a saying goes, “two heads are better than one.”______, teamwork has greater power.
| A．In other words | B．On the other hand |
| C．On the contrary | D．In addition |
______ your strength, you have got to know who you are and listen to yourself before doing anything else.
| A．Finding | B．Found | C．To find | D．Having found |
Without my parents’ encouragement and support I definitely ______ where I am today.
| A．wasn’t | B．hadn’t been |
| C．wouldn’t be | D．wouldn’t have been |
We share the resources of the world, ______ any action of waste can affect other people.
| A．so | B．if | C．unless | D．because |
Mary wrote a letter to her parents, ______ she missed them and was studying hard.
| A．to be said | B．said | C．saying | D．having said |