21. If I ............................. (study), I.....................................................(pass) the exams. 22 If the sun........................... ( shine), we ........................ (walk) to the town. 23. If he ............................. ( have) a temperature, he ............................ ( see) the doctor. 24. If my friends .............................( come), I .....................................( be) very happy. 25. If she.........................( earn) a lot of money, she ..............................( fly) to New York. 26. If we .......................( travel) to London, we .................................( visit) the museums. 27. If you .............. ( wear) sandals in the mountains, you......................( slip) on the rocks. 28. If Rita ............. (forget) her homework, the teacher....................(give) her a bad mark. 29. If they...........................(go) to the disco, they ..............................(listen) to loud music. 30. If you .............................(wait) a minute, I............................(ask) my parents.