—______ did you sleep last night?—Only five hours. I stayed up late to do my homework.

Mike ______have stolen the money from the bank,______he appeared to be rich overnight.

—Is it necessary to look up every new word when I come across it in reading?—No. You ________， because you are likely to guess the meaning from the context.

Today, we _____ work as hard as people did in the past.

Why _______ you be so stubborn? You should think over my advice on this matter.