1) ... you leave now, you'll be late for work. a) if b) unless 2) I'll call you ... I'm not busy in the afternoon. a) unless b) if 3) I'll go shopping .... I wake up early on Saturday.  a) if b) unless 4) ... you book your tickets in advance, you won't get to see the concert. a) unless b) if 5) ... you water the flowers regularly, they won't grow. a) if b) unless 6) ... doesn't rain tomorrow, we will go on a picnic. a) if b) unless 7) ... he studies hard, he won't pass the exams. a) if b) unless 8) You can take any table ... it is reserved. a) if b) unless 9) They won't come to the party ... you invite them. a) if b) unless 10) ............. I meet him, I'll tell him the whole story. a) If b) Unless

If or unless?

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