Ⅰ.根据句意及首字母或汉语提示完成句子
1．At the beginning of this term, our teacher d________ us into six groups.
2．There are no empty s________ left on the bus. The girl has to stand all the way.
3．One t________ is one thousand kilograms.
4．Everyone has the ________(职责) to protect animals.
5．My brother bought a ________(二手的) computer. It is very cheap.
