Sentence Completion (Items16-25)
Directions: Read each sentence and choose the alternative that BEST
completes it.

The product manager is explaining to the visitors _____.
1. when does each machine in the shop work
2. when each machine in the shop is working
3. how did each machine in the shop work
4. how is each machine in the shop working
5. how each machine in the shop works
5. how each machine in the shop works