She can run 100 meters in 13 seconds without()herself.
A. executing
B. inserting
C. exerting
D. devoting
This machine works very well so long as no one()with it.
A. interferes
B. disturbs
C. upsets
D. interrupts
While the development of the suburbs has created problems, it has also provided() modern housing for millions of people.
A. excessive
B. immense
C. memorable
D. substantia
Shaking hands when people meet each other for the first time is practiced as a()way of greeting.
A. conventional
B. conservative
C. constant
D. convenient