1. The first English__________（专利） for a typewriter was issued in 1714.
2. The monitor_________（区别） himself by his performance in the examination.
3. Petrol is the most important_________（产品） of many Middle East countries.
4. Because the temperature dropped _________（突然），the south of China suffered a heavy snow.
5. Please come to my home to play cards whenever it is _________（方便的）for you.
6. The dog wagged its tail in_________（期望）of a bone.
7. The_________（仁慈的）guard saved him from death.
8. The only thing to do is to throw_________（谨慎）to the winds.
1. patent 2. distinguished 3. product 4. abruptly
5. convenient 6. expectation 7. merciful 8. caution