Danny loves singing very much. We usually hear her_____after school.
The population of the world in 20th century became very much _________than that in 19th.
If you have lost a library book, you have to _________ it.
If anyone wants to say something in class, you ________ put up your hands first.
-- __________ you ________ your book to the library?-- Yes. I returned it yesterday.
The missing boys were last seen ______ near the river.