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