用所给动词的适当形式填空
（1）Jim________(write)a letter at that moment．
（2）The telephone________(ring)while she________(do)her homework．
（3）When I________(leave)the party，the people________(enjoy)themselves．
（4）________they________(feed)the animals at 5:00 yesterday afternoon？
（5）Mrs.Green________(not wash)clothes at this time yesterday．
（6）Grandpa________(mend)his clock when I reached home．
（7）While I________(walk)in the park，I saw some children playing games．