The limits of a person's intelligence, generally speaking, are fixed at birth, buthe reaches these limits will depend on his environment.
She concentrated her energies __________ her test.
My deskmate and Tom are similar __________ each other __________ character.
The company,__________ in 2003, is one of the most famous compa-nies.
—How often do you eat out?—__________,but usually once a week.
I was so familiar with him that I recognized his voice __________ I picked up the phone.