Use "because" before a clause . Use " because of " before noun
1.He retired at forty mainly...ill health
a.because
b.because of
2. They called the trip ... bad weather
a.because
b.because of
3.We could not reach on time ... the traffic was terrible
a.because
b.because of
4. ... the language problem , I couldn't win the argument
a.because
b.because of
1.He retired at forty mainly...ill health
a.because
b.because of
2. They called the trip ... bad weather
a.because
b.because of
3.We could not reach on time ... the traffic was terrible
a.because
b.because of
4. ... the language problem , I couldn't win the argument
a.because
b.because of
1.B
2.B
3.A
4.A