On snowy days, you have to drive very ________ to avoid traffic accident.

All the travelling fare, unless specifically stated _________, includes admission charges to the attractions, shows and exhibitions we visit.

The students are ___ young people between the age of sixteen and twenty.

What has he been doing _________? I haven’t seen him much recently.

— Are you going to travel during this summer vacation?— No, I’ll have to do some part-time job for my study. __________, there’s a disease spreading.