合同订立后也可出现变更、转让与解除的情况,其中合同转让包括（）。
There'snodoubtthatthisisnottheway____Icamelasttime.
Everymeans____triedoutbutneverwithsuccess,asfarasmyknowledgegoes.
It’snecessary______ustokeepourpetscleaneveryday.
Thelittleboydidn’tknow_______.
Ihopeyouwillspendasmuchtimeasyoucan________yourEnglish.
