—What do you think of the dish? —It is sweet and sour, but isn’t __________.

—What do you think of the report about the air pollution on TV last night?—I think the situation is so        that we should take action to protect the environment.

 If you have __________ where my lock might be, please tell me at once.

I don’t like this book . It’s         .

Carol is getting old and he can’t jump as _______ as he did..