He _______ bring back a no longer used method.
A. proposes to
B. proposes
C. suggests to
D. suggests
Underground tubes were used in many cities to _______ the transport of mail between post offices and government buildings.
A. speed high
B. speed up
C. lift up
D. lift off
The _______ air was used to push the capsules from one station to the next.
A. compress
B. compressing
C. compressed
D. to compress
Translate the underlined word in the sentence "In 1900 Charles Smith, then postmaster general of the United States, wrote that letter."
A. 然后
B. 比较
C. 那么
D. 当时的