Beginning in the early 1960s, humans ________ probes to explore other planets.
A. launched
B. laughed
C. lawed
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The _________ against rats in our city got off to a good start.
A. camp
B. cam
C. campaign
Many __________criminals were proceeded against following World War II.
A. campaign
B. battle
C. war
The year 1939 had witnessed the ___________ of Poland by Germany.
A. conquer
B. conquest
C. request
After a fierce battle, the troops _________southward.
A. retreated
B. retreat
C. treated