1.We_______buy lunch in the canteen.There's a shop next to the school and it sells sandwiches and other snacks
   A.have to      B.don't have to         C.mustn't         D.should
2.The teacher asked us to choose a book from the list,real it at home and then write a_______about it
  A.project         B.presentation        C.report        D.revision
3.Our math teacher,Mr.Thomas is funny and friendly,but he gives us too much_______to do after school
 A.homework         B.exams          C.essays        D.exercise
4.Nick got 100% on his physics test.His twin brother,Adam,______,had to retake the test
A.although        B.but          C.so          D.however