请根据句意，并用其适当形式填空，使句子通顺。
1.___________ (careless) will be a disaster not only to ourselves but also to patients.
2.To break the ____________ (silent), the teacher told a joke and the students all laughed right away.
3.My grandfather still stays healthy in his (ninety).
4. They often meet and share their (think), feelings and experiences.
5.There are two ____________(dictionary) on that shelf.
6.He is not afraid of making a (speak) in front of many people.
7.You should talk to your teacher when ____________ (feel) sad.
8.He has made little progress (simple) because he is crazy about computer games.
9.When I saw him, he_____________(wait) for the bus at the bus stop.
10.Danial would rather _________(wear) green than red.Red is a girl’s colour.
1.carelessness 2.silence 3.nineties
4.thoughts 5.dictionaries
6.speech 7.feeling 8.simply
9.was waiting 10.wear