1.how----- ----- feel to be back to school again after graduation for 20 years?

1.how----- ----- feel to be back to school again after graduation for 20 years?
Ado you B.does that c,did you d,does it
2.Tom sat under a tree and seeing his friend,---------up in no time.
a.to stand b.standing c.stood d.would stand
3.---can i join your club,dad
---you can when you ------a bit older
a.get b.wlii get c.are getting d.will have got
4.---I'm sorry to keep you waiting .
---oh,not at all.I---------here only a few minutes.
a have been b.had been c.was d.will be
5.I need one more stamp before my collection -------
a.has completed b.completes c.has been completed d.is completed
最好有得出答案的原因，