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Mary  (will cook) dinner as soon as she _  (is) through with her homework.

It  (is) 7 o'clock now. I  (do not, know) when  he  (will return) and whether he  (will come) at all.

They  (are leaving) for Paris in two days' time. The plane  (starts) at 3 pm sharp.

Tomorrow, if you  (feel) well, I  (will let) you go for a walk.

We  (shall go) on an excursion if we  (pass) the exams successfully.

Everyone  (knows) that when it  (is not) hot, snow  (begins) to melt easily.

I  (promise) I  (will write) to you every day.