既然他们已经迟到了，那干脆点外卖也无妨。

Since they're running late, ___they ___might ___as ___well order takeaway.

既然你提起了，我索性就坦诚地说出我的顾虑吧。

Since you've brought it up, ___I ___might ___as ___well be honest about my reservations.

既然雨停了，我们走路去车站也无妨。

Since the rain has stopped, ___we ___might ___as ___well walk to the station.