Mark needs to learn Chinese ________ his company is opening a branch in Beijing.
| A．unless | B．until |
| C．although | D．since |
The young couple,who returned my wallet,left _____ I could ask for their names.
| A．before | B．while |
| C．after | D．since |
It was really a great to all the teachers and parents that no students were injured in the accident.
| A．help | B．relaxation |
| C．relief | D．favor |
According to a recent survey, homework is ______ students most often blame for their lack of sleep．
| A． why | B．that |
| C．what | D． which |
All the books donated by the students from urban schools are said ________ to the students in the earthquake-stricken areas the other day.
| A．to have been sent | B．being sent |
| C．having been sent | D．to be sent |
I will be surprised if you can get Calvin, who is a close-fisted man, ________ these donation draw tickets from you.
| A．buy | B．buying |
| C．to buy | D．buys |