请帮我讲一下现在分词过去分词和不定式的使用区别

请帮我讲一下现在分词过去分词和不定式的使用区别
1.—— very sorry for himself,Tony sat there with his head buried in his hands.
A.To feel B.Having felt C.Feeling D.Felt C
2.—— of the city life,John dreams of getting back to countryside.
A.Tiring B.Tired B
3.Neil Armstrong was the first man —— on the moon in July,1969.
A.landing B.landed C.to land D.lands C
4.My parents and I —— Beijing at this time tomorrow.
A.will visit B.visit C.am visiting D.will be visit D
5.Eating fruits and vegetables can help us get —— from heart disease.
A.protected B.to protect C.protecting D.to be protected A
6.—— to win a gole medal in the coming Olympics Games.Tony has been training hard every day in the last two years.
A.Determined B.To determine C.Be determined D.Be determining A
7.With so many people —— at her,the little girl felt nervous on the stage.
A.looking B.to lood C.looked D.having looked A
8.—— about the student,Mr.Liu called his parents to find out why he didn't go to school this afternoon.
A.Concerning B.To concern C.Concerned D.Having concerned C
9.—— his theory on many calculations,Nicolaus believed the sun was the center of the universe.
A.Based B.Basing C.To be based D.Being based B
10.All those —— about the people in the earthquake-hit area should be thanked.
A.concerned B.are concerned C.who concerned D.concerning A