1 . —According to the legend, sailors could hear mermaids ________ in the night each time they sailed across that part of the sea.
—Right. People were afraid, so they ________ in many gods at that time.

A．sang; believe

B．are singing; believed

C．singing; were believing

D．sing; believed

2 . —I heard William ________ when I came into the classroom.
—Yes, and then everybody was staring at him.

A．laughed

B．laugh

C．laughing

3 . —Do you often hear John ________ in his room?   
—Listen! Now we can hear him ________ in his room.

A．sing, to sing

B．sing, sing

C．sing, singing

D．to sing, singing

4 . I heard the dog __________ (bark) loudly.

5 . At midnight, when I heard my dog ________ (bark), I knew someone was coming to my house.

6 . When I passed the music room, I ________ some students ________ a beautiful song.

A．hear; are singing

B．hear; singing

C．heard; singing

D．heard; are singing

7 . I heard a dog ________ in the next house now. Did you know what ________?

A．bark; happened

B．barking; happen

C．barking; happened

D．to bark; happened

8 . —Last night, I woke up at midnight and heard a fire engine ________ past my house.
—It turned out that one of my neighbours’ house was on fire.

A．to drive

B．driving

C．drove

D．is driving