1. In today's information age, the loss of data ________ cause serious problems for a 
  company.

     A. need                B. should         C. can            D. must

2. Samuel, the tallest boy in our class, ________ easily reach the books on the top shelf.

     A. must                B. should         C. can            D. need

3. I love the weekend, because I ________ get up early on Saturdays and Sundays.

     A. needn't             B. mustn't        C. wouldn't       D. shouldn't

4. --- Can't you stay a little longer?

--- It's getting late. I really ________ go now. My daughter is home alone.

     A. may                 B. can            C. must           D. dare

5. --- I am sure I saw Brian in the park this morning.

--- You ________ be imagining things. He left for America last night.

     A. need                B. can            C. must           D. shall