She hardly ever speaks English after class, for she is afraid       mistakes.

Mrs. Wang found his little son ______ with his toys alone when she arrived home. 

It’s important             exercise every morning.

---What made you so_________? ---Oh, Mr Wu told us a funny story and it made us _________. 

—Have you decided _______ to Xi’an? —Yes. I’ll go there by train. It’s much cheaper than by plane.