From his _______look, I could see that he didn’t believe what I said.

_____　in the front row at theceremony, our distinguished guests are from home and abroad.

She knows so much about England. She_____ there before.[ ]

He was finally admitted to BeijingUniversity. Never in all his life ______ so happy.

It was not until dark _____ he found _____ he thought was the correct way to solve the problem.