when Newton was sitting under an apple tree.
| A．Fell down an apple | B．Down an apple fell |
| C．An apple falls down | D．Down fell an apple |
In order to find _______ better job, he decided to study _________ second foreign language.
| A．the; a | B．a; a | C．the; the | D．a; the |
Whatpity that you couldn’t be there to receive prize!
| A．a; a | B．the; a | C．a; the | D．the; the |
Let’s go tocinema-that’ll take your mind off the problem
for while
| A．the; the | B．the; a |
| C．a; the | D．a ; a |
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |
My neighbor asked me to go for _________ walk, but I don't think I've got _________ energy.（）
| A． | a; 不填 | B． | the; the | C． | 不填; the | D． | a; the |