Here are the odd ones out for each set along with the syllable breakdown for each word:

1. **C. career**
- **A. roadside** (road-side)
- **B. petrol** (pet-rol)
- **C. career** (ca-reer) - **Odd one out** because it refers to a profession, while the others relate to vehicles or driving.
- **D. garage** (ga-rage)

2. **D. quality**
- **A. caravan** (car-a-van)
- **B. instructor** (in-struc-tor)
- **C. pavement** (pave-ment)
- **D. quality** (qual-i-ty) - **Odd one out** because it refers to a characteristic or grade, while the others relate to travel or driving.

3. **D. reverse**
- **A. bypass** (by-pass)
- **B. signpost** (sign-post)
- **C. crossroads** (cross-roads)
- **D. reverse** (re-verse) - **Odd one out** because the first three are related to road navigation, while reverse refers to a driving action.

4. **A. tomorrow**
- **A. tomorrow** (to-mor-row) - **Odd one out** because it refers to time, while the others are related to modes of transportation.
- **B. motorbike** (mo-tor-bike)
- **C. hospital** (hos-pi-tal)
- **D. exercise** (ex-er-cise)

5. **A. dangerous**
- **A. dangerous** (dan-ger-ous) - **Odd one out** because it is an adjective describing a risk, while the others can describe in terms of value or degree of difficulty.
- **B. beautiful** (beau-ti-ful)
- **C. expensive** (ex-pen-sive)
- **D. difficult** (dif-fi-cult)

To summarize, the odd ones out are:
1. C. career
2. D. quality
3. D. reverse
4. A. tomorrow
5. A. dangerous