Read the topic sentence. Sherlock Holmes was a world-famous detective who used observation skills to solve crimes.

Which piece of evidence from The Mystery of the Lost Gem best supports this topic sentence? (2 points)

a
Sherlock Holmes noticed scratches on the floor near the wall.

b
Sherlock Holmes opened the door, and Mrs. Hudson introduced his client.

c
Sherlock Holmes silently vowed that he would find the gem and the thief.

d
Sherlock Holmes was reading by the fire when he heard a knock at the door.

The “big dig” the “big dig” (the central artery/tunnel project) has been complex and challenging. located in boston, massachusetts, this tunnel is eight lanes wide and three-and-a-half miles long. what is most amazing about this tunnel is that it is constructed under a major highway and skyscrapers located in boston’s financial district. construction crews used “clamshell excavators” during this dig. these machines carved narrow trenches, and then a special substance was pumped into the trench to keep the dirt from caving in. finally, steel beams were lowered into the trench and concrete was pumped in. one problem that engineers faced while constructing the tunnel is the fact that the soil beneath boston is extremely loose and soggy. engineers solved this dilemma by freezing the soil and pumping very cold water into pipes beneath the city. to strengthen the soil even further, a special type of glue was injected into the ground to with the consolidation of the soil. 23 which phrase best defines the word excavator as used in the passage? a. a device used to measure underground temperatures b. a device used to level uneven surfaces c. a device used to move heavy objects d. a device used to dig holes