如果鲨鱼的数量降至过低，就会给海洋生物带来危险。
If numbers of sharks drop ________ low, it will bring ________ to all ocean life.
我们齐心协力就能带来变化，创造更加美好的未来。
So together, our ________ can make a difference and lead to a better ________.
Let’s go hiking, ________ ________ (完成反意疑问句)
There is a potato on the table. (改为复数句)
There ________ some ________ on the table.
Jack didn’t have breakfast this morning. Tom didn’t have breakfast, either. (合并为一句)
________ Jack ________ Tom had breakfast this morning.
He said, “I have worked in this factory for three years.” (改为间接引语)
He said that ________ ________ worked in that factory for three years.
