This design is ________ satisfactory.So you’ll have to try your best to better it.

——　Have you ever seen a whale alive? ——　Yes, I’ve seen ＿＿＿. 

Freedom-loving young students dislike being restricted by rules, especially ______ which are “outdated” in their eyes. 

—What do you think of these two books?—______ of them are interesting.And I’ve read them several times.

My parents want to go ______ on vacation.