Though having lived abroad for years, many Chinese still       the traditional customs.

 Although we hadn’t met for twenty years, I recognized him ____ I saw him.

It is a common ____ to have a cake with candles to celebrate a holiday ，birthday or any other occasion.

 The moonlight was bright and about 15 yards up the road there was a deep ___ thrown by a tree.

New mineral resources may be discovered during the forthcoming Antarctic _____.