Last Thursday when I got to the airport, I ____I had left my ticket at home.

. Only in a few countries in the world _______ a reasonable standard of living.

If you _____ smoke, please go outside.

Accustomed to ______ the steep mountain, he had no difficulty reaching the top.

Could you help me_______ when the plane will take off on the Internet ?—— I’m sorry , my computer doesn’t work.