My most devoted friend, Professor Yang, _______ often go hiking when he lived in the mountain that was covered with forest.

The doctor insisted that the patient _______ seriously ill and that an operation _______ in no time. 

——Ms Lin looks rather a kind lady.——But in fact she is cold and hard on us. You ____ believe it!

When I first met him, it seemed as if he______food for days.

Don't handle the vase as if it ______ made of steel.