1. The musicians_____yesterday have played together for many years
a. to who we listened b. who we listened to
c. to that we listened d. to whom we listened
2. Many scientists have claimed that _____like music are often good at mathematics
a. children b. children who c. children whom d. whose children
3. The student______had an impressive record
a. the prize was awarded b. that the prize was awarded
c. to whom the prize was awarded d. who the prize was awarded
4. Those_____have used our services for more than one year can enter the competition
a. who b. whom c. which d. whose