wonder why he has been acting so strangely these days.—Recent pressure at work may his behavior.

15. We all greatly ___ your cooperation in the building of the power station .

What’s wrong—I can’t do my homework now. I my homework in the classroom this morning.

Mary knows so much about ______earth! —Yes, although she is only ____eight- year-old girl.

I got in his old truck and off ______ to one of the far corners of the farm to fix the fence. [ ]