1.The boy appeared from under his bed 这个男孩从他床下出来
2.The guide dog is helpful for a blind man 导盲狗对盲人是很有帮助的
3.We started to climb the tower after lunch 我们吃完饭后开始爬山
4.The machine will start by itself in a minute 机器会立刻启动
5.There is an umbrella behind the door 门后边有一把雨伞