B. 1. for some new drugs 2. with new drugs
3. the drugs that are new 4. of the drugs which are new
C. 1. if he is with enough confidence
2. unless he is confident enough
3. should he have enough confidence
4. if he will feel confident enough
D. 1. which will work 2. in order that it can work
3. that is working well 4. so that it might work well