The word “variety” is ________ “kind” ________ meaning.

Which song do you like better, Lucy—I prefer the song Little Apple________ can attract many people.

how did your English exam go—I thought I ____, but in fact I came inthe top 10% in the class

The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?—______ my students have a try?

Stepsmust be taken ______this kind of disaster will never happen again.