_____ our earth, otherwise it will be no longer fit for us to live on.

Don’t worry about,Mom. I can take care of ..

My classmates are all nice _____ me. We always chat _____each other at lunchtime.[ ]

As a wise department manager, he possesses a unique way to ______ huge tasks into small and doable units.

The tourists ______ have been to Mount Huang lost ______ in the beautiful scenery there.