After going into the concert hall, the mother _____ a friend and went over to greet him.
When deeply absorbed in work, ______ he often was,he would forget all about eating or sleeping.
George said that he would come to school to see me the next day, but he ______.
Jerry did not regret giving the comment but felt ______ he could have expressed it differently.
One learns a language by making mistakes and ______ them.
By the time you have finished this book, your meal ______ cold.