Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

Based on the provided questions, here are the answers indicating which word has a different pronunciation in each case:

**Question 1:**
The odd one out is **D. beat** (pronounced /biːt/). The others (A. lead, B. meat, C. lead) have a long vowel sound.

**Question 2:**
The odd one out is **C. athlete** (the "-th" sound is different). The other three (A. wrestling, B. event, D. strength) have a different set of consonants.

**Question 3:**
The odd one out is **D. basic** (stressed on the first syllable). The others (A. formal, B. polite, C. tiring) have different stress patterns.

**Question 4:**
The odd one out is **C. advertising** (stressed on the third syllable). The other three (A. biography, B. temperature, D. ambulance) have different stress patterns.

In summary:

1. D
2. C
3. D
4. C