25. These two countries are similar ______ they both have a high snowfall during winter.

26. Parents always tell us not to stay ________ there is danger.

23. Tom had to be told two or three times ________ he could remember what the teacher said.

30. It is the test system, rather than the teachers,______is to blame for the students’ heavy burden nowadays.

28. You can’t complain of being lonely____you don’t make any effort to communicate with others.

23. We went into a hall, on_____walls hung a few pictures of some famous scientists.

All he was thinking about was ____ he would do with the big sum of money his father gave him.

Willie has complained to the sales manager about the PC he bought _____ screen exploded for no reason.

My parents don’t mind what job I do ________I am happy.

The process of producing electricity may also give out CO2, _______ you heat your house with electricity instead of charcoal.