When do you have math?—I have it _____ Monday, Tuesday and Thursday.[ ]

Have you heard of the news about the missing Malaysian plane?－Of course, people all over the world want to know _______.

I hate people _______ talk too much but do little.

He has little acquaintance _______ music , while he has a wide knowledge ____ painting．

Listen！Helen is singing in the next room.—It _____be Helen .She has gone to Beijing.