Directions: In the questions given below, there is a sentence in which one part is given in bold. The part given in bold may or may not be grammatically correct. Choose the best alternative among the four given which can replace the part in bold to make the sentence grammatically correct. If the part given in bold is already correct and does not require any replacement, choose option (e), i.e. “No replacement required” as your answer.

Q:

The relatively static lattice in a diamond ensures that the scattering is at a minimum and the thermal conductivity is exceptional good.

• 1
  are exceptional
• 2
  was exceptional
• 3
  are exceptionally
• 4
  is exceptionally
• 5
  No replacement required