because or because of

I’m happy __________ I got a good grade on my test.

• because

• because of

They moved to a new city __________ his job.

• because

• because of

He was late __________ he missed the bus.

• because

• because of

I’m tired __________ I didn't sleep well last night.

• because

• because of

We didn’t go swimming __________ the cold water.

• because

• because of

She felt better __________ she took some medicine.

• because

• because of

The restaurant is popular _______ its good service.

• because

• because of

She smiled __________ she was happy.

• because

• because of

We couldn't go to the park __________ the bad weather.

• because

• because of

He passed the exam __________ he studied hard.

• because

• because of