Since Sarah was urging him, Charles called back again, but no one answered. He raised his head and said doubtfully. "Dad still doesn't answer his phone."

Sarah felt that something was wrong. After thinking for a while, she said, "He just called us, why doesn't the answer now? Is something wrong with him?"

Trying to come up with a reason, Charles answered. "Maybe he felt lonely and wanted to talk to us, but then something came up, and he couldn't answer my call."

"Do you ...