-- _____is that used for?---_____ the floor.
When I study English, I like to put my dictionary________my reach so that I can refer to it when necessary.
The two girls are so alike that strangers find________difficult to tell one from the other.
The manager had fallen asleep where he_______,without undressing.
Give yourself 10% of________is left for your work and let me have the rest.
The school has developed an online system________ students can choose their own teachers.