阅读短文，从方框中选择恰当的词并用其适当形式填空，使短文完整、通顺。每词限用一次，其中有两个词是多余的。

as，sound，they；clever，send，imagine，heavy，hear，lucky ，know，if，follow

Mr. and Mrs. Brown were farmers in South Australia．They lived there for many years．They had a kangaroo(袋鼠)infamily．The kangaroo was called Lulu．Several years ago，Mr. Brown's son gave Lulu to him a gift for his 60th birthday. Soon Mr. Brown and Lulu became good friends and Lulu often him around the farm．
One day when Mr. Brown was working on his farm，a(n)tree branch(树枝)fell on top of top of him suddenly(突然)．Mr. Brown fell to the ground(地面)and didn'twhat happened next．Lulu stood next to Mr. Brow's body．She started barking(叫)and didn't leave Mr. Brown．“She like a dog．She barked and barked．And she didn't stop．”said Mrs. Brown．After Lulu's barks, Mrs. Brown quickly went to see what had happened．She saw Mr. Brown lying on the ground andhim to the hospital right away．，Mr. Brown was saved．
“Lulu is great!”said Mr. Brown．“She saved me! She is a friendly and very kangaroo．”After Mr. Brown left the hospital, he took Lulu everywhere he went．