41. Mr. Smith is very kind-hearted and capable. You are really _______ in having such a good teacher.
13. In any case, parents should make clear _______, if any thing, the children are expected to pay for with the money.
14. Many new games are designed on the computers all the time; people of all ages ______ these games.
15. --- Who are the teenagers gathering at the school gate? --- Well, if you _____ know, they are all my visiting students.
16. Nothing taught by others can have the same effect on you as _____ learned by yourself.
17. In China, _______ bicycle is ______ popular means of transportation.