Canberra is a city __________ between Sydney andMelbourne.
— This apple pie is too sweet, don’t you think so?— ____________. I think it’s just right, actually.
Not until all the fish died in the river ____________ how serious the pollution was.
If he ___________ my advice then, he would not be in trouble now.
It doesn’t matter ___________ you turn right or left at the crossing — both roads lead to the park.
It was in the school __________ he had studied ___________ he began the important experiment.