A: Listen! Is it Linda singing in the next room? B: No, it __________ be her. She is still in Shanghai.

We _______ play on this road. There is too much traffic. 

On rainy days, accidents ______ happen sometimes on steep roads．

—Look at the young lady in red. Is it Mrs. King?—No, It ________ be her. She is wearing a white dress today.

—Why are your eyes so red？You________have slept well last night.—Yeah，I stayed up late writing a report.                          (