1. The busiest thing is when the farmer is getting ready to grow plants.
2. He has to turn the ground over first.
3. Because there were no machines.
4. Farmers do not need rain.
5. Yes.
1.根据One of the busiest things is when the farmer is getting land ready to grow plants.可知最繁忙的事情时当农民开始种植时。
2.根据If the farmer is going to grow wheat, he has to turn the ground over first可知他首先要翻地，故答案为：He has to turn the ground over first。
3.由one farm and one machine can do as much a day as twenty men used to do without a machine可知以前没有使用机器，故为：Because there were no machines。
4.根据If heavy rain falls, the farm must wait for the ground dry out before the machine can cut the wheat.可知如果下大雨的话，农民得等地面干了才能用机器来收割小麦，故不需要雨水，答案为：Farmers do not need rain。
5.此题为一般疑问句，根据Everyone helps so that all the wheat can be taken from….可知每个人都得帮忙去收割小麦，故答案为：Yes。