2 Complete the sentences with the correct form of the verbs brackets. Use the present simple and will. 1 If we __________ (fly) less when we travel, it __________ (reduce) pollution. 6 Some endangered species __________ (become) extinct if we __________ (not protect) them. 7 We __________ (not be) late if Dad __________ (give) us a lift. 8 If our natural resources __________ (run out), humans __________ (not have) enough energy to survive on Earth. 9 More people __________ (have) homes if we __________ (build) larger houses.