I can remember very few ______ when he had to cancel his plans because of poor health.
It was his first time to make a radio broadcast. __________, he walked towards the microphone.
—Did you enjoy yourself at the party?—Yes. I've never been to __________ one before.
He is very popular among his students as he always tries to make them __________ in his lectures.
My advisor encouraged __________ a summer course to improve my writing skills.
The policeman asked __________ with the old woman.