_云南成考网

S: I’m sorry. Professor Johnson is not here at the moment. This is his assistant, Sally.  _____52_____?

The reason________the president kept silent is still unknown.

• A、how

• B、why
  

• C、when 
  

• D、what

How does Peter get second-hand cartoon books now?

• A、He buys them from bookstores.

• B、He goes around collecting them.

• C、He borrows them from his friends.

• D、He waits for people to sell them to him.