1 a) Read the text. Then use the linking words in the box to complete the gaps. * On the other hand * On the one hand * Furthermore * To sum up * However

1) On the one hand, research on animals has brought us many benefits. It helped us discover ways to help people and other animals live healthier lives in the future. Moreover, scientists claim that there is no other way to test if certain drugs are safe for living beings. 2) However, many of these experiments cause pain to animals. Animals have rights too and it's cruel to make them suffer. 3) On the other hand, not all animal testing has brought benefits to human beings. 4) Furthermore, there are strong arguments both for and against animal testing. Nowadays, scientists try to make experiments as humane as possible. 5) To sum up, I believe that animal testing is cruel and scientists should keep trying to find other methods to test new drugs.