Complete the sentences with an appropiate form of the words in the box.
a. The populated of the world is growing. Will we be able to grow enough food?
b. One reason GM crops are science is that we do not know what the health risks may be.
c. engineer want to recreate the woolly mammoth.
d. Is it controversy to clone a human being?e. Genetic ethics is a new discipline.
2. Complete the sentences with the verbs in parentheses in the correct tense.
a. did he sometimes used (use) the internet to find information?
b. When the scientists cloned the first animal? (clone)
c. The woolly mammoth existed (not exist) for thousands of years now.
d. do we will be able to (be able to) stop people from getting old in the future?
e. the scientists did (do) enough research about the effects of GM crops?