—May I see your ticket, please? I think you ________ in my seat.
—Oh, you’re right．My seat is upstairs．I’m terribly sorry.
| A．are sitting | B．sit | C．sat | D．have sat |
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 |
It's a great ______ to know you, a world-famous physics scientist.
A, precaution B. privilege
C. privacy D. prescription