I am trying my best to learn English, but it doesn’t work well! —Don’t worry! Regard it _____ a big challenge! [ ]

Is_______ necessary to learn another language? — I think so.

Why didn’t you do your math homework last weekend? — My cousin borrowed my math book and didn’t_____ __it.

Many famous players like Tiger Woods play sports _____.[ ]

Bruce works very hard. —-_____.