You’d better book the tickets in advance; _______ we may miss the concert.[ ]

Which do you like better, tea or milk —-I don’t mind, _______ is ok.

Could it be in the room __________ we had a talk last night__________ you left your keys? [ ]

The souptoo much salt．—I’m sorry, sir．I’ll change it for you

It is his strong sense of humor, as you know, makes him popular with teachers and students.