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II.  Complete the sentences with: must, mustn't or needn't.

 1. I must study for my exam tomorrow.  It's really important.

 2. They needn't do the washing up, they have a dishwasher.  
3. You mustn't run in the gym.  It's dangerous

4. You mustn't exercise after a meal, or you'll be ill.
 5. Tennis is very popular so you must book before you arrive.
 6.  You needn't bring a basketball.We can lend you one.  
7. You mustn't smoke in the changing rooms.  
8. Teachers needn't wear suits for work, but their clothes must be neat and clean.  
9. Students mustn't use their mobile phones during the exams.  
10. You must arrive on time for lessons.  It's important not to be late

IV.  Choose the word or words in each box that correctly complete each sentence.  (Post TOEFL Junior)

 (D) A student from Barksdale High School won this year's regional mathematics competition.  
Ellen Murphy was among ten finalists in the last round of the competition.  The final question was a very (B) difficult  algebra problem.  The first student to answer the question correctly was named  (B) is the winner.  One student finished the problem (D) faster than Ms.  Murphy, but his answer was incorrect.  Ms.  Murphy solved the answer correctly and took the grand prize.