11. We will phone you at once if he ……isn't………(not, be) present at school.
12. A local man helped us. But for that we …wouldn't reach…..(not, reach) the cave.
13. The flat is small but near our college; otherwise, we …won't choose……(not, choose) it.
14. She’s going to Paris. Come and see her tomorrow; otherwise, you …won't have…… (not, have) chance to meet to her.
15. One of my friends advised me; otherwise, I ………would make………..(make) a mistake.
16. If David did the test more carefully, he ……would pass……..(pass) the exam.
17. I couldn’t run my company if my uncle ………didn't help…………(not, help) me.
18. If he had enough money, he ……would buy…………………………..(buy) a new car.