几道高中语法题 1.Who would you rather ___ the report instead of you

几道高中语法题
1.Who would you rather ___ the report instead of you?(A)
A.have write B.have to write C.Write D.have written
2.We'll be free tomorrow,so I suggest ___ to the history museum.
为什麽不是to visit而是a visit?
3.Although parents seem ___ good advice to their sons and daughters,their kids have marked them poorly on being good role models when it comes to dealing with life’s difficulties.
为什麽不是seem to give 而是seem to be giving?看不出是进行时啊
4.Until now,talking giraffes have starred in cartoons,but never ___ making a sound in really life.
为何是have they been heard不是have they heard?哪来被动?
5.Mr Wang made up his mind to devote all he could ___ his oral English before going abroad.
为何是to improving 不是 to improve?to後面可以加doing?什麽原理