1)i will be if he manages to sell that motorbike at a high price A surprise B surprised C surprising D to surprise 2)unless you understand i explain it again to you A am B was C will D would 3)if you know where she lives please let me A know B knew C known D to know 4)if he a student he will get a discount A is B was C were D will be 5) you are interested in this film don't go to see it at any cost A if B unless C because D so 6)if you like that book i will give it you as my present A for B from C at D to 7)if you live in this small town you earn much money A aren't B couldn't C can't D didn't 8)if you have money you can travel abroad this summer A a lot of B many C lot of D a lots 9)if you are a student you can get a discount books A on B in C at D for 10)i won't go unless you me the money back A to pay B paid C paying D pay