Most of the students haven’t finished their papers on time for __________reasons---one of which was that they carried out a week-long investigation in the countryside.
| A．previous | B．accurate |
| C．original | D．various |
They can find whatever they need in the supermarket, ______ is always busy on Sundays.
| A．which | B．when | C．where | D．who |
Beyond the lake _____ quantities of birds coming from the North every winter.
| A．flies | B．flying | C．flied | D．fly |
Referring to reading, we must have the patience to read ______ book so that we will have _______ deep understanding of it.
| A．the; the | B．a; a | C．the; a | D．a; / |
The weight of the moon is only about _____ of that of the earth.
| A．one eighty | B．one of eighty | C．one the eightieth | D．one eightieth |
My partner wants to keep the company small _____ I’d like to expand it.
| A．and | B．or | C．however | D．while |