Grandpa was shocked by the news. Rarely ______ him so quiet.

the accident happened? — It’s said to happen on his way to work

Smoking is bad for your health. You should .

It was _______pleasant surprise for the mother to see her son ____had been missing for nearly ten years that she didn’t know what to say.

This book is said to be a special one，which________many events that cannot be found in other history books