Hundred. Note: hundred thousand and million take the plural form if they're not preceded by a numeral or by a: e.g.: Thousands of people were present.
Sheep, deer, salmon, Knowledge, Progress.
Thunder and lightning. Note: that when one thing is meant we say a clasp of thunder and a flash or bolt of lightning
Machinery. Note: that machinery is a singular noun and always takes a singular verb and pronoun. We can say : a pieces of machinery
money + singular verb. Note: that money is always singular and takes a singular verb and pronoun.
News + singular verb. e.g: l' m glad to hear the news is good. Note: news always takes a singular verb. we say a piece of news or an item of news. This is a good piece of news.
Note that the names of sciences and subjects ending by ICS like mathematics, physics, politics, gymnastics; and statistics generally take a singular verb.
