29. He was busy preparing a speech , only _______ once in a while to rise from the table for a tea .
I have no idea ____________ measures the government will take to stop the river from being further polluted.
Scientists are convinced __________ the positive effect of laughter _________ physical and mental health.
The little girl __________ the money for herself, but she __________ it away.
He was caught in the rain, __________ himself catch a cold.
It _______ we had stayed together for a couple of weeks _______ I found we had a lot in common.