Reason clauses

Choose the correct option/s. When more than one option is correct, choose all the correct options.

John turned on the lights ... it was dark.
1. because of
2. since
3. as
She couldn't concentrate ... there was a lot of noise.
1. as
2. because
3. because of
... he was new to the area, he didn't know anyone.
1. Since
2. As
3. Because of
She passed the exams with excellent grades ... her hard work.
1. because
2. because of
3. since
She paid by credit card ... she didn't have enough cash with her.
1. as
2. because
3. for
The didn't go ... the fog.
1. because
2. since
3. because of
Some trees fell down last night ... it was windy.
1. because
2. because of
3. since
Henry started jogging ... his doctor told him to.
1. as
2. since
3. because
4. because of