I had planned to invite Tom to the party to increase the atmosphere, but it turned out that his arrival ____ the atmosphere.

 She is a well­known doctor now, but she ________ as a cleaner at the hospital for five years.

I ________ in London for many years，but I've never regretted my final decision to move back to China.

My uncle ______ until he was forty –five. 

The army officer _______ his men to fire as soon as the enemies came up.