1．We are not ____________ (乐观的)about the outcome.
2．The young man was ____________ (逮捕)for stealing a car.
3．He ____________ (命令)that the prisoners should be set free.
4. If you____________(转换)roles with your husband，you may understand him better.
5．It is said that building ____________ (材料)are expensive now.
