My uncle, who is a businessman, often travels _____ air.
My uncle, who is a businessman, often travels _____ air.
A. on
B. in
C. by
D. from
A. on
B. in
C. by
D. from
A. of
B. in
C. about
D. on
A. of
B. in
C. about
D. at
A. to
B. over
C. in
D. on
E. from
A. At
B. Of
C. With
D. In
A. at
B. at a
C. at the
D. in
E. in the
A. into
B. In
C. inside
D. None of these