A giant helium（氦） balloon is telling residents of Paris how good or bad the air quality is．When it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green．_________, it’s red．
| A．Though terrible | B．Whenever good |
| C．If worse | D．When bad |
We should do more such exercises in the future， I think， _____ those we did yesterday.
| A．than | B．as | C．like | D．about |
It is reported that two schools, ________are being built in my hometown, will open next year.
| A．they both | B．which both |
| C．both of them | D．both of which |
To many youngsters of today, a computer is ____ a gun is to hunters, as is well known.
A as B like C what D that
The new-opened park is such a beautiful place that it is well worth_______.
| A．visit | B．to be visited | C．being visited | D．visiting |
The pair of leather boots that I bought last weekend_______ comfortably.
| A．wears | B．is worn | C．was worn | D．was wearing |