Ballet is not popular our city because most people think it is too expensive to take the classes.
| A．in | B．with | C．among | D．on |
—How long have you been here?
— ______ the end of last month.
| A．In | B．By |
| C．At | D．Since |
Evidence has been piled up ______ drinking water after getting up in the morning contributes to one's health.
| A．what | B．which |
| C．if | D．that |
I'll bring some medicine just ______ some of us get sick while travelling.
| A．as if | B．in case |
| C．even though | D．as long as |
His ______ of mind during driving nearly caused an accident.
| A．absence | B．presence |
| C．abnormality | D．abandonment |
It ______ me that 1 could buy the admission ticket of the exhibition at the discount of 50% with my student card， ______ made me extremely excited.
| A．happened to; that | B．occurred to; it |
| C．happened to; which | D．occurred to; which |