My grandma’s after-supper ______ includes: walking the dog in the neighborhood and dancing in the park with many other aged women..

In Scandinavian countries it is common ____ for the husband to stay at home to look after the baby.

 Professor Jordon is well known for his _____ into the habits of the common housefly.

I listened to Dr．Wilson's lecture about the protection of wild animals, but I was unable to grasp its key     .

—Hi, this way, please.—OK.I sometimes have no sense of ______ when I arrive at the crossroad.