根据短文内容，在每一空格内填写一词，使短文完整连贯。
The doorbell rang and Mrs. Carson opened the front floor. Her heart sank 1______ she saw Mrs. Burbridge.
2______ Mrs Burbridge called; she stayed for hours and hours.
"Good afternoon, Mrs. Carson," Mrs. Burbridge said. "Do come in," Just 3______ Mrs Carson had feared,
Mrs. Burbridge stayed for several hours. It was nearly six o'clock 4______ Mr. Carson would be home from
work soon...
Mrs. Carson kept wondering 5______ she would ask Mrs. Burbridge to leave without making her angry.
"Has your husband got home from work 6______,"Mrs. Carson asked. "Oh, yes," Mrs. Burbridge answered.
"He always gets home at about five o'clock..." "It's nearly six o'clock. Won't he be getting worried about you?"
Mrs. Carson said.
"I thought of 7______," Mrs Burbridge said. "8______ it's so pleasant here. We've had such a lovely
afternoon. You know 9______ I'll do? "I'll ring up my husband 10______ tell him to come round, too. May
I use your phone, please?"
所示该安全标志表示的意思是（）。