Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No improvement.

She has been writing this novel for a year but she did not finish it yet.

If three numbers are in the ratio 3:5:6 and their LCM Is 2160, then find their HCF.

Clock: Time:: Thermometer:? 

In a class of 54 students, 24 drink milk, 28 drink tea and 8 drink none. Find how many drink both milk and tea?

Directions: Each sentence below has two blanks , each blank indicating that something has been omitted . Choose the set of words for each blank which best fits the meaning of the sentence as a whole.

She would prefect . . . . . . travel early rather . . . . . . during peak hours.

The instrument which uses sound waves to measure the depth of oceans is