What are the quick tips for Subject 1 and Subject 4?

[LeElle]

1. Priority principle: Turning vehicles yield to straight-going vehicles; right-turning vehicles yield to left-turning vehicles; vehicles on the right have the right of way; safe vehicles yield to dangerous ones; unobstructed vehicles have priority. 2. The following are all correct: Safety: Intermittent light braking, ensure safety, guarantee safety, pass safely. Yield to others: Slow down and yield, stop and yield, give way politely, slow down and avoid. Slow: Pass slowly, decelerate, steadily, gradually, pass at a reduced speed, decrease speed uniformly. Observation: Observe in advance, observe carefully, observe attentively, keep a lookout. Prohibited actions: Must not, should not, cannot, strictly prohibited, forbidden, should not be done.