Hoàn thành các câu

Sure! Here are the completed sentences:

1. If you don't revise carefully, you **may not perform** well on the coming exam. (negative)

2. If we recycle and reduce waste, we **may discover** the amount of landfill space needed. (positive)

3. If you're going on a long trip, you **should avoid** to pack essential items like a first aid kit and extra clothing. (negative)

4. If students explore extracurricular activities, they **may complete** new talents and interests. (positive)