With the Internet widely used, a(an)___change has taken place in the way people communicate with one another.

How old is the babyboy——He is an ________ boy.

Why did Tom become wealthy this year?—Because he sold _________________ he did last year.

After that, he knew he could ________any emergency by doing what he could to the best of his ability.

Jack will go to Australia for further study tomorrow, so he ____ his luggage at present.