Identify the errors in the following sentence

Identify the errors in the following sentence
1.He wanted to know how the way they behaved.[ 1分]
A.to knowB.ow the wayC.theyD.behaved
2.That is troubling me is that I don’t have much experience in international commerce.[ 1分]
A.ThatB.isC.much experienceD.in international commerce
3'Not until my mother told me the sad news last night did I knew that our neighbor Dr. Li was killed in a car accident the week before.[ 1分]
A.Not untilB.the sad newsC.did I knewD.was killed
4.Since the beginning of this century, more and more scientists have become interested in the way how the human brain works.[ 1分]
A.Since the beginningB.have becomeC.inD.the way how
5.Mary was shocked to realizing that it was time for tides to come in.[ 1分]
A.was shockedB.realizingC.wasD.tides
6.I got two vases in China. All of them are expensive.[ 1分]
A.gotB.vasesC.AllD.are
7.:"Excuse me," he said, with more dignity than I would thought of possible considering his appearance.[ 1分]
A.thanB.thought ofC.consideringD.appearance
8.After making observations for a week, Sam found why Mr. Hobbs’s short factory was so inefficient.[ 1分]
A.making observationsB.for a weekC.foundD.so