Điền vào chỗ trống từ thích hợp

6. I ______ Texas State University now.A. am attending B. attendC. was attending D. attended7. He has been selling motorbikes ________.A. ten years ago B. since ten yearsC. for ten years ago D. for ten years8. Christopher Columbus _______ American more than 500 years ago.A. discovered B. has discoveredC. had discovered D. had been discovering9. He fell down when he ______ towards the church.A. run B. runs C. was running D. had run10. We _______ there when our father died.A. still lived B. lived still C. was still lived D. was still living