1. is
2. your, the most prestigious
3. doesn`t explain, us
4. are reading, was published
5. more interesting
6. have arrived
7. was sitting, stood, went
8. mouse (во множественном числе слово не изменяется, меняется произношение)
9.is allowed
10. did, youth
11. policemen (произносится как "полисмин"), caught
12. will go, will come
13. thought, have ran