几道英语语法题,

几道英语语法题,
1._____Annie's glass,I apologized to her.
A.To break B.Breaking C.Having broken D.Break答案选了C
2.The father was delighted to hear the child ___that.
A.to say B.to have said C.say D.said
3.More and more trucks are seen ___between these two towns these days.
A.run B.to run C.be running D.being run答案选了B
4.The old man has two daughters,____are doctors.
A.both of them B.both of whom C.both who D.they both答案选了B
5.It is most desirable that he ____for the information by himself with a few clicks online.
A.search B.searched C.has searched D.will search答案选了A
6.The professor,____as a splendid speaker,was warmly received by the students.
A.known B.to be konwn C.knowing D.having known答案选了A
7.It costs her a lot of money,but she doesn't regret____a year traveling around the world.
A.to have spent B.to spend C.spent D.spending答案选了D
8.____with the developed countries,some African countries are left far behind in terms of pepole's living standard.
A.Compare B.To compare C.Compared D.Comparing答案选了C
9.At the international conference,the famous scientist gave an excellent report____on his recent experiment.
A.basing B.based C.to be based D.to base答案选了D
10.The grain output of this year is much higher than ____of last year.
A.that B.such C.which D.what
请问为什么以上10个题要选这些答案,每道题的考点是什么?请分别说一下.