Plz tell Ex. (R)

R. Using a suitable form of the given verb, complete the text given below.
1. By the time we get to Varanasi this evening, we (drive) ........ more than four hundred kilometres. We are going to be exhausted.
2. When Neha goes on vacation next month, she (study) ........ German for over two years. She should be able to communicate fairly while she is in Austria.
3. I have not travelled around much yet; however, I (visit)....... the Red Fort by the time I leave Delhi.
4. By the time you finish studying verb tenses, you (master)...... all twelve tenses, including their respective passive forms.
5. Meenal had called and said she would be here at eight o'clock. By them she gets here, we (wait)........ for her for two hours.
6. Farid just changed jobs again. If he keeps doing this, he (change) ........ jobs at least four or five times by the end of the year.
7. By March, my grandmother and grandfather (be) ........... married for fifty years.
8. By the end of the year, I (live) .......... in Kolkata for ten years.