202.Some crops are relatively high yielders and could be planted in preference to others to _____ the food supply.
A) enhance
B) curb
C) disrupt
D) heighten

203. Astronomers at the University of California discovered one of the most distant _____.
A) paradoxes
B) paradises
C) galaxies
D) shuttles

204. Many great scientists _____ their success to hard work.
A) portray
B) ascribe
C) impart
D) acknowledge

205. The sign set up by the road _____ drivers to a sharp turn.
A) alerts
B) refreshes
C) pleads
D) diverts

206. The doctors don't _____ that the patient will live much longer.
A) monitor
B) manifest
C) articulate
D) anticipate

207. Call your doctor for advice if the _____ persist for more than a few days.
A) responses
B) signals
C) symptoms
D) reflections

208. We find it impossible to _____ with the latest safety regulations.
A) accord
B) unify
C) obey
D) comply

209. Professor Smith and Professor Brown will _____ in presenting the series of lectures on American literature.
A) alter
B) alternate
C) substitute
D) exchange