According to scientists, our mental abilities begin to _______ from the age of 27 after reaching the highest level at 22．
| A．decline | B．differ | C．fail | D．shrink |
Is that a book on farming? If so, I want to borrow___.
| A．this | B．one | C．it | D．the one |
--How long will you stay there?
---_____.
| A．Two and half weeks | B．Two and a half week |
| C．Two weeks and a half | D．A half and two week |
.Who is making so much noise in the garden?
__ the children.
| A．It is | B．They are | C．That is | D．There are |
Four isof two.
| A．double | B．two | C．the two | D．the double |
Andeison entered the classroom, ____book in ___hand.
| A．×, his | B．×, × | C．a, × | D．a, the |