1. On the one hand I'd like a job that pays more, but on the other hand I enjoy the work I'm doing at the moment.
2. However much you prepare for the exam, there will still be a few questions on which you won't be sure of the answer.
3. One shouldn't forget that animals suffer from being kept in cages.
4. I like my job but at the same time I've been doing the same thing for 4 years.