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请用can、must、need的适当形式完成下面短文。
Three friends were jumping together all the way until they came to a river. Mr Bird said he couldn’t jump over the river, but he could fly across and wait for them on the other side. Mr Frog asked, “1.
Mr Grasshopper explained his idea to them and gave a piece of advice, “I have a good idea! Mr Bird, you fly to a tree, bring back a stick and throw it on the water. While you and I stand on the stick, Mr Frog can swim to lead us across the river. And then we can stay together.”
Mr Grasshopper’s plan worked very well. Soon the three friends were together on the other side of the river and rested on the grass. How happy they were!
Three friends were jumping together all the way until they came to a river. Mr Bird said he couldn’t jump over the river, but he could fly across and wait for them on the other side. Mr Frog asked, “1.
Can
I swim to cross it on my own and wait for you? I think we 2. needn't
cross the river together.” Then Mr Grasshopper（蚱蜢）replied, “I don’t think so. I cannot jump or fly so far, nor can I swim. If we still want to play together, the three of us 3. must
work together!”Mr Grasshopper explained his idea to them and gave a piece of advice, “I have a good idea! Mr Bird, you fly to a tree, bring back a stick and throw it on the water. While you and I stand on the stick, Mr Frog can swim to lead us across the river. And then we can stay together.”
Mr Grasshopper’s plan worked very well. Soon the three friends were together on the other side of the river and rested on the grass. How happy they were!
答案
1. Can
2. needn't
3. must
2. needn't
3. must
