elen saw his tutor nod ________ to her, shecalmed down and went on with her performance

下列各句中，没有语病的一句是（ ）

What’s your favorite , Bob—Cats. They’re so lovely.

I have to _________ now It is time for class — OK, I’ll call back later

Two Chinese cargo ships, the Hua Ping and Yu Xing 8 were attacked by ________ armed people on the Mekong River on Oct.5.[ ]