"Then perhaps you might be able to help me," he suggested, with a mock expression of concern.

There's a mock expression of terror on his face, and he bellows, "My god!"

He Paused and his face took on a mock 'concerned' expression.

She came up to the edge of the cart and leaned on it just below his face, a mock solemn expression on her lips.

Turning to stare at the doctor, Mog affected a mock expression of shock.

George again put on his mock conspiratorial expression.

"Just one question," Wendy said with a mock serious expression.

Louise looked at him with a mock stern expression.

- he inquired, with a mock expression of sympathy.