【题目】I ____my homework when someone knocked at the door.

【题目】I can't tell you what she said.I've promised ____it a secret.

【题目】There ____ a conert at the theatre on Saturday evening.

【题目】She doesn’t go to work, ____she is ill.

【题目】Do you know the risk ____investing?

【题目】She is going to ____ the plane to Beijing.

【题目】Would you like ____ to the cinema with me ?

【题目】Not only my friends but also I _____interested in music.