| I. Choose the right options to complete the sentences. In some answers, you may need to add a comma.

1 | We missed the train ★★★.
A. so the traffic was heavy C. because of the heavy traffic | B. because the heavy traffic D. because of the traffic was heavy

2 | She packed extra clothes ★★★.
A. because she expected cold weather C. so she expected cold weather | B. because of she expected cold weather D. because expected cold weather

3 | It started to rain ★★★.
A. because we had to cancel our hike C. because had to cancel our hike | B. because of we had to cancel our hike D. so we had to cancel our hike

4 | They booked a hotel near the airport ★★★.
A. because they had an early flight C. so they had an early flight | B. because of they had an early flight D. because had an early flight

5 | 1 was tired after the journey ★★★.
A. because 1 went to bed early C. because went to bed early | B. so 1 went to bed early D. because of 1 went to bed early

6 | We had to wait for two hours ★★★.
A. because was a technical problem C. because a technical problem | B. so there was a technical problem D. because of a technical problem

7 | The weather was great ★★★.
A. because we decided to go hiking C. so we decided to go hiking | B. because of we decided to go hiking D. because decided to go hiking