Ⅰ. 单句语法填空
1. Having selected (select) the proper present, they sent it to their respectable professor.
2. Not knowing (know) what to do, the children had to wait for their parents to come back.
3. Hearing (hear) the signal, people ran out of the building.
4. Judging (judge) from the appearance, it is very peaceful, but in fact, a war will break out soon.
5. The decision having been made (make), what is to be done now is how to carry it out.
6. Working (work) harder at English, you’ll make greater progress.
7. When exploring the cave, they found a valuable mineral.
8. It being (be) Sunday, many people go to the gymnasium to do physical exercises.
9. Looking (look) out through the window, we saw beautiful scenery.
10. The case shocked the public, causing (cause) a hot debate over human nature on the Internet.
