用括号中所给单词的适当形式填空。

26. I can look after ________ (I), although it won’t be easy for me.

27. The Smiths and my family live on the ________ (five) floor, we are good neighbours.

28. When you lend the new camera to others, please tell them to use it ________ (proper).

29. I want to think about it a bit longer before I make a ________ (decide).

30. You’d better avoid ________ (make) such a mistake again in our daily life.