My brother would like to buy a good watch but _______ was available from that shop.

How far can you run without stopping — ______________ I’ve never tried

Time ______, I’ll arrange for you to meet Professor Li before you leave for Japan.

When I met him the other day，it was the first time we________each other since we were at school.[ ]

Steps must be taken _________ this kind of disasterwill never happen again