Mary had to go to a meeting，so she left her children ___________ at home.

The scientist __________ the experiment forhalf a year, but he _______ yet.

Millie has _____free time than Sandy because she has____ work to do than Sandy.

He _______ have escaped, but he chose to stay and fight.

ke to have visited the Palace Museum, but somethingunexpected _______ to my father.