1. Determination and discipline.....necessary to master a foreign language. (be) 2. The jury.....not in arrangement on the validity of the evidence. (be) 3. Until last year grammatical errors, not organization.... the instructor's main concern. (be) 4. Tourists could see fish (swim).... along the brook. 5. The form teacher has asked Jack (write)......an essay on the Thames. 6. It's sometimes may be difficult (get)....a taxi during rush-hours 7. The rain has made the children (stop)...their games. 8. She tells the driver (take) ...her to the railway station. 9. Does Mrs.Green have them (carry)..... those books back home? 10. The principal noticed those pupils (try)....harder and harder.