He _____the problem _____in his mind for a whole week before he did anything about it.

---Have you ______ some new ideas? --- Yeah, I’ll tell you later.

Mr．HoffTman, aged over 60, has recently _______playing golf at the weekends．contributing to his rosy face．

 To get a better grade, you should ______ the notes again before the test.

In order to meet the deadline, Professor Smith along with his assistants       the project day and night.