They ___________ the echoes, how the waves bounce back.
A. understand
B. analyze
C. dispose
D. spread
His desk is covered with ___________ gadgetry.
A. electronic
B. clear
C. dynamic
D. requirement
This function allows you to cut and ___________ text.
A. Ignite
B. enlarge
C. paste
D. delete
These ___________ are not very meaningful.
A. write
B. statistical
C. statistics
D. delete