Science is more than a collection of unrelated facts; to be meaningful and valuable,________ must be arranged to show generalized character.

Studying Wendy’s menu, I found that many of the items are similar to ______ of McDonald’s.

Teaching is ________ everybody can do; it requires patience as well as professional training.

---Is there ________ water in the bottle?---Yes, there is _______.

Don’t worry. You can _____he ‘ll turn up on time. He always keeps his promises.