It puzzles the scientists _____ some mammals produce their young _____ others lay eggs．
| A．that; while | B．what; while | C．that; as | D．what; as |
Most of the old are somewhat cut off from the fast developing world and that’s why they are so easily ________ by the cheaters.
| A．taken in | B．taken up |
| C．taken on | D．taken off |
—Have you got the ticket to the football match?—No. When I got to the ticket office, ______ was left.
| A．nothing | B．none | C．no one | D．few |
A British education official has urged primary schools in his country to return to _______ traditional "whole class teaching" method in order to reproduce its success in China, _______ Daily Mail reported on Sunday.
| A．a; the | B．a;a |
| C．the; the | D．the; a |
________ in the pervasive sunshine in the Southern Hemisphere of November, the Australian continent is brimming with vigour and vitality.
| A．Bathing | B．Bathed |
| C．To bathe | D．Having been bathed |
I look forward to my fifth trip to this land _______ I will pay a state visit to Australia and attend the ninth G20 summit, in Brisbane.
| A．during which | B．on which |
| C．at which | D．which |