Exercises

11. The security caught them while they _________.

are shopping	were shopping
shop	was shopping

12. The BTS ________ before I reached the station.

has to leave	has been leaving
had left	leaves

13. We _________for Ellen for more than two hours.

wait	are waiting
have waited	have been waiting

14. How long ________ for the Math’s test?

have you been studying	are you study
did you studied	does you

15. If Tony continues smoking like that, he _______ a lung disease.

would have	will have
will be infected	has

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