Tom, clean up the broken glass _________ someone walks on it.
Jack was in low spirits those days and his friends did all they could _____ him up.
See the model ship ____in the pool? That’s what my father made for me last weekend.
Though I was tired out that evening, I _____ from falling asleep by the great pain in my knee.
Simon was _____ why many of his friends didn’t turn up at his birthday party.
Without gravity, we _____ walk on the ground as freely as we do now.