Choose the best answer:
6. Although the backyard is wet, ________ we play soccer in the backyard.
A. so B. because C. and D. ɵ
7. He has played soccer ________.
A. ten years ago B. since ten years C. for ten years ago
D. for ten years
8. At Tet, children _______ new clothes and walk out.
A. will wear B. wear C. have worn D. are wearing
9. I ______ to New York three times this year.
A. have been B. was C. were D. had been
10. Jack ________ the door.
A. has just opened B. open C. have opened D. opening