The professor could tell by the _________look in Mars's eyes that she didn’t understand a single word of his lecture.
The gentleman does not ____the argument but watches the other guests.
If people keep polluting the rivers, no fish there will survive ___.
____ the weather, the athletic meetings will be held on time.
The ground is slippery. Hold onto the rope and don’t ____.
The week-long rainfall has ___ landslides and flooding in the mountain areas.