______ in the centre of the busy city, their supermarket attracts a lot of customers every day.
| A．To locate | B．Locating | C．Located | D．Locate |
There’s ____ dictionary on ____ desk by your side.
| A．a; the | B．a; a | C．the; a | D．the; the |
I earn 10 dollars ____ hour as ____ supermarket cashier on Saturdays.
| A．a; an | B．the; a | C．an; a | D．an; the |
The sign reads “In case of ____ fire, break the glass and push ____ red button. ”
| A．不填；a | B．不填；the | C．the; the | D．a; a |
Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited.
| A．the; the | B．不填; 不填 | C．不填; the | D．a; the |
In _____ preparation for the launching of Shenzhou Ⅶ, scientists need ______ knowledge of weather changes.
| A．the; the | B．a; ∕ | C．∕; a | D．the; a |