Controlling the costs of your business m...sing and operations.

Listen! She____in the classroom. A: is singing B: sing C: to sing D: is sing

He ________ in the next room. A: is often heard to sing B: often heard to sing C: is often heard sing D: is often hearing to sing

—What did Mr. Black do in the middle of the night —Well, I’m not sure, but he was often heard (). A: singing the same song B: to sing the same song C: sing a same song D: to be playing same song

Listen!Joan__________(sing)intheclassroom.Sheoften__________(sing)there.

listen! Some girls in the classroom. A: are singing B: sing C: is sing

Listen, who_________(sing) in the music room? Oh, Mary_______(sing) there.

Cold doth not sting, 3)___________________: Cuckoo, jug-jug, pu-we, to-witta-woo! A: the pretty birds do sing B: the pretty bird does sing C: the pretty birds sing D: the happy birds do sing

It<br/>is a good time _______. A: sing B: to sing C: singing D: sang

Most of the young people enjoy ______ the popular songs. A: sing B: to sing C: singing