They enjoyed fresh watermelon last fall because they______ watermelon seeds in the spring.
| A．were planting | B．would plant | C．have planted | D．had planted |
In order to continue to live well when we leave school, we must _______ learn some useful skills as well as study in the school.
| A．in all | B．above all | C．after all | D．at all |
In recent years, laws have been passed to stop wild animals from _______.
| A．killing | B．to be killed | C．being killed | D．having killed |
To their great _______, they found their son arrived home safe before the storm.
| A．surprise | B．relief | C．amazement | D．disappointment |
We would appreciate _______ if you could give us some advice on how to solve this problem.
| A．that | B．you | C．it | D．this |
Besides wildlife on land, there are species living in the oceans _______ we still know little.
| A．about which | B．in which | C．for which | D．with which |