Recycling is one way to protect the environment; reusing is ______.
| A．another | B．the other |
| C．one another | D．one |
I don’t know who invented __________ telescope, but I think it is __________ most
useful invention.
| A．the, the | B．the, a | C．a, the | D．a, a |
Rarely _____________________ .
| A．the temperature falls below zero here | B．falls the temperature below zero here |
| C．does the temperature fall below zero here | D．has the temperature fallen below zero here |
This is the only way we can imagine _______ the overuse of water in the students’ bathrooms.
| A．reducing | B．reduced | C．reduce | D．to reduce |
Studies show that people are more _______ to suffer from back problems if they always sit before computer screens for a long time.
| A．likely | B．possible | C．sure | D．probable |
--- How do you 
ofen spend your time?
---- Personally speaking, there is nothing happier than reading a book, _______ a cup of coffee.
| A．drunk | B．be drinking | C．drinking | D．to drink |