I. Combine two sentences into one, using the connectives from the list: and, but, because, so, therefore, or, moreover, however, if, when, unless. 1. You can’t borrow my dictionary. You bring it back on Monday. ________________________________________________________________________ 2. The cost of installation is very high. Solar domestic heating systems are economical to use. ________________________________________________________________________ 3. Solar panels are placed on the roof of a house. The Sun’s energy is used to heat water. ________________________________________________________________________ 4. I don’t agree with a lot of his teaching methods. He is a good teacher. ________________________________________________________________________ 5. We’d better not waste water. We won’t have enough to drink sooner or later. ________________________________________________________________________ 6. The house is quite beautiful. The cost is not too high. ________________________________________________________________________ 7. Do you want to study more? Do you want to look for a job? ________________________________________________________________________ 8. You can go home. You’ve finished this exercise. ________________________________________________________________________ 9. I don’t get many opportunities to practise my English. I find it difficult to remember everything I study. ________________________________________________________________________ 10. I’m practising speaking English a lot. I don’t want to fail in the oral test. ________________________________________________________________________