The book is of great value. _______ can be enjoyed from it until you have a deepunderstanding of it, however.

—Good morning，Mr Brown. Would You please tell me the result of the exam？— OK. You did quite well，You made      mistakes.

. I prefer a street in a small town to _____ in such a large city ____ Shanghai.

. Tom said he had been working for three hours, ________, evidently, was untrue.

-- Who is dancing to music in the next room?-- ________ the children.