Put the verbs in brackets into the correct tense. 15 If he (give) up smoking, he would feel a lot better. *
16 We (not be) lost if we had a map. *
17 If you (study) hard, you will pass the exam. *
18 If he gives us any more work, we (not do) it. *
19 If you cool water to zero degrees, it (form) ice. *
20 If you put food in a fridge, it (last) longer. *