It was necessary for Sammy to listen to her parents' advice, but she didn't. (SHOULD)

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Jane Goodall started to study chimpanzees at the age of 26.

Jane Goodall has ________________________________________________________.

Circle the letter A, B, C, or D to indicate the best option for each of the following questions.

We can save our forests by limiting the demand________ trees, land for agriculture, materials for construction.

Generation gap is the differences in thinking and acting between two or more generations.

Giving money is a good way to support beggars.

We should use energy supplied by solar panels and other renewable energy sources so that we can reduce carbon emissions. (IN ORDER TO)

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Eating lunch at school is an option __________ by most state schools.