1：The pigs swing their ears and ------ very happy.A / B be C are
问题描述：
1：The pigs swing their ears and ------ very happy.A / B be C are
2:In summer sunshine starts to -----the sky.
A fil B fills C filling
请说明为什么,
答
1.C are
主语The pigs 为复数.因此用are.
2.A fill
start to do sth.开始做某事(不定式作宾语)