People appreciate _______ with him because he is knowledgeable and humorous.
A、talkingA
appreciatedoingsth.愿意，喜欢做某事。句意：人们喜欢同他交谈是因为他既博学又幽默。
Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.
_______ at all is worth doing well.
Thechallengeisnotoneofexpansion._______,therapidgrowthinenrollmentoverthelast40yearshascometoanend.
Hedeclined_______moreaboutit.
名词解释：preferredstock
