1．A sudden stop can be a very frightening experience，especially (especial) if you are travelling at high speed.
2．I went to a workshop and gradually (gradual) got good at making things with clay(黏土)．
3．As children get older，they become more and more interested in the things around them.
4．(2019·云南昆明期中)If we make good use of public transport, the environment will be better.
5．Although he is known to only a few，his reputation among them is very great.
6．There are several reasons for sleep. We sleep because we need to dream.
7．It is a long time since they separated, but it won't be long before they meet again.
