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. 2) However, many of these experiments cause pain to animals. 3) Furthermore, not all animal testing has brought benefits to human beings. 4) On the other hand, there are strong arguments both for and against animal testing. 5) To sum up, scientists try to make experiments as humane as possible.