We can never expect bluer sky unless we create less polluted world.
| A．The; the | B．/; the |
| C．A; the | D．a; a |
In the experiment we kept _____ watchful eye on ______ developments and recorded every detail.
| A．a; / | B．/; the | C．a; the | D．/;/ |
I remember the time _____ Eric won that speech competition.
A where B why C when D which
You like travelling, _____ you?
A don’t B won’t C didn’t D haven’t
Jack, _____ friend, went back to America last Monday.
A me B I C my D mine
— My bike is broken. _____ I use yours?
— Sure. Here it is.
A Must B Will C Should D May