--do you often hear Lucy ________in her room?

?? -- Yes, listen! Now we can hear ________her in her room.

A. sing; sing???? B. singing; singing?? C. singing; sing? D.? sing; singing

—Maria likes singing. Do you often hear her _______ after class?

—Yes, I do.

A．sing              B．to sing            C．sings             D．sang

—Maria likes singing. Do you often hear her _______ after class?
—Yes, I do.

----Do you often hear Tom _____________ in the next room ?

----No, but he is often heard ______________ the guitar in the garden outside.

A. sing; to play　 B. to sings; play　　 C. sing; play　 D. singing; play