4. Complete the following sentences:
a) 1. I can't possibly... 2. How can I possibly...? 3. We couldn't possibly... 4. You can't possibly.;. 5. How could we possibly... ? 6. ...if you possibly can.
b) 1. This textbook is meant for... 2. I wonder who... meant for? 3. ...is evidently meant... 4. ...wasn't meant...
c) 1. That part of the house was nice if... 2. The lecture was educational if... 3. The meeting was useful if...