He was so busy. He cannot afford enough time with his son _____ he wants to.
| A．even if | B．as if | C．because | D．before |
The passenger was tired and walked slowly but he got home____.
| A．after all | B．in all | C．above all | D．at all |
A booking-office is a place _______ tickets are sold.
| A．when | B．where | C．why | D．which |
This is the reason _______ he was absent.
| A．that | B．which | C．why | D．what |
Listening to loud music at rock concerts ____ caused hearing loss in some teenagers.
| A．is | B．are | C．has | D．have |
______ the task is difficult, they managed to complete it on time.
| A．Because | B．Therefore | C．As | D．Though |