35 –Michael was late for Mr Smith’s oral class this morning–_____? As far as I know, he never came late to class

Large quantities of solid fuel ______consumed every day and too much carbon dioxide is sent into the air, which in turn _______ the going up of temperature.

After he retired from teaching, Robert began to _______ painting.

The chairman was about to declare the conference open ____ the lights went all out

You can trust him because he always ________.