You needn’t have come in person --- a letter _____enough.

---Dad, must we wait until the light becomes green?---Yes,I’m afraid we      .That’s the traffic rule.

–________ you turn down your radio, please? –Yes, I can.

“You ________ have a wrong number，”she said.“There's no one of that name here.”

—Look! The boy in the white shirt ___be Tom. --It ____be him. I saw him enter the library just now.