详细解释下高三英语的几个单选题,谢谢

详细解释下高三英语的几个单选题,谢谢
寒假作业中做到的 遇到了些麻烦
1.(D)Though __ his MBA course,this young manager still has a long way to go in his practical work.
A.considering finishing B.considered to finished C.considering having finished D.considered to have finished
这道题consider的用法是什么,有to do吗
2.(A)I often wonder why my neighbor still bought another apartment __ he was already owned several houses.
A.when B.while
while不是解释为虽然,用在句中也合适啊
3.(B)What a pity it is that Bob __ the habit of smoking.
A.developed B.fell into C.switched into D formed into
我感觉这道题四个选项都可以啊
4.(C)When people talk about the famous attractions in Hangzhou ,the first __ comes into their mind is the West Lake.
A.place B.one C.that
代词..解释下吧
5.(B)-The Golden Week is coming!Will you go to certain places together with us?
-__.I can still remember last year's terrible experience,so I'll just stay at home.
A.No way B.Not really C.Think nothing of it
C为什么不对,A呢
感激不尽