Accidentals

When you will observe the sheet of music before the sight reading, it will be good if you will find the accidentals (Sharp and flat signs)

No accidentals

Plenty of accidentals

In the initial reading of each piece of music the tempo can be sacrificed, but not evenness, accuracy, and expression. This is one of the most important insights for developing good sight-reading habits.    

If there are pitch and rhythmic inaccuracies, then the speed is too fast. Accuracy and evenness are important guidelines for you. Sight-reading which snatches at notes in a hazardous, bumpy way is neither confidence-building nor gratifying in any way. The overall effect must be a musical one. Accuracy includes all the detail on the page: dynamics, tempo changes, phrasing, terms and signs. 

Carefully scan the next example. There is a lot of everything: accidentals, key changes, patterns, sequences, scales, dynamics etc.