Choose the right completion. 1. yesterday i quarreled with my boss about i am terribly sorry. a) who b) which c) that d) whom 2. i decided to quit politics i might have a great career in it. a) because b) though c) since d) whenever 3. i am really anxious about this situation, i hope we can find a solution. a) ever since b) because of c) although d) however 4. various changes during the centuries, the cathedral remained largely unaltered. a) despite b) despite of c) in spite d) although