Helen was much kinder to her youngest son than to the others,___,of course,made the others envy him
____ he works hard, I don’t mind when he finishes the experiment.
____, he does not know the answer.
We were ____ to go out for a camp ____ it began to rain.
____ several times, the young scientist still kept on doing his experiments.
It was last October ____ they finally came back to their hometown.