They were ________ busy ________ with each other ________ the time.
| A．too; talking; to forget | B．so; talking; that they forgot |
| C．so; to talk; that they forgot | D．too; to talk; to forget |
-How many books are there in the box?
-_______.
A. None B. No one C. No
There _________a book and three pens on my desk just now，but now there is nothing on it.
A. had B. were C. was
Nobody except Tom and Mary _______in the classroom. The other students are watching the basketball game on the playground now.
A. am B. is C. are
How time flies! We'll graduate. Three years really s short time.
A. was B. are C. is
There________ many trees in front of my house now.
| A．is | B．are | C．was | D．Were |