Make sentenses using the following prompts example: this problem | for too long they have been trying to solve this problem for too long 1. the presentation | several days 2. the custimers | twenty minutes 3. this conference | two weeks 4. this fax | 7 o'clock 5. this subject | three terms 6. the lecture | two hours 7. the perfomance | several month 8. training | one year