Sometimes, e-mail can be the most _________ form of communication, for messages can be exchanged within a very short time.
A. effective
B. urge
C. disturb
D. identify
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We have invited an expert ______ this area to give us a speech.
A. in
B. to
C. onto
D. aside
If you are too busy, just call me to help ________.
A. out
B. aside
C. about
D. apart
His knowledge is only limited ________ what is taught in class.
A. in
B. to
C. of
D. off
I de____ nothing other than to be left in peace. So just go away.
A. sire
B. sires
C. sired
D. siring