—I remember I left my laptop in the study last night. Why ________ here?
—Oh, I thought you might need it so I brought it here for you.
| A．does it come | B．has it come | C．had it come | D．will it come |
Apples are usually sold by ______weight, and eggs are sometimes sold by ______ dozen.
| A．the; the | B．不填; a | C．不填; the | D．the; a |
Susan, ______ university student from Europe, teaches me ______ art in her spare time.
| A．an; 不填 | B．a; the | C．a; 不填 | D．an; the |
These young people are now making an active ______ to beautify our city.
| A．part | B．effort | C．decision | D．plan |
--- My son is lost. Did you see a boy pass by here?
--- I saw ______ boy hidden behind ______ tree over there. You may go and have a look.
| A．a; the | B．不填；the | C．a; 不填 | D．a; a |
The need for an operation，especially an immediate operation， almost always comes as a ______ to the patient and his family.
| A．result | B．happiness | C．disappointment | D．shock |