So far， the couple （not change） their flat since they had a second child．
Shared bikes can help people travel around freely in cities without （污染）．
Can we put another bed in this room？
Sure． It is big for a third one．
When talking to British people， we should （避免） subjects like age， weight or money．
With all her efforts， the children finally （接受） her as one of the family．
A long time ago it was （广泛地） believed that there was life on Mars．