IV. 1.you can’t brorrow my dictionary unless you bring it back on Monday
2.The cost of installation is very high although solar domestic heating systems are economical to use
3.Solar panels are placed on the roof of a house because the Sunday’s used to heat water
4.I don’t agree with a lot of his teaching methods however he is a good teacher
5.we’d better not waste water or we don’t have enough to drink sonner or later
6. The house is quiet beautiful and the costs isn’t too high
7.Do you want study more or you want to look for a jobs?
8.You can go home unless you have finished this exercise
9.I don’t get many opportunities to practice my English because I find it difficult to remember everything I study 10.I’m practising speaking English a lot because I don’t want to fail in the oral test