Let's ________.

1. A.
   to play ping-pong
2. B.
   playing ping-pong
3. C.
   play the ping-pong
4. D.
   play ping-pong

He looks sad. Let’s ___________________.

Who broke the door? Let’s__________.

A. look it out      B. find it out       C. take out it      D. keep out it.

He looks sad. Let’s ___________________.

Everyone ______ here now. Let’s ________.

A. are , begin    B. are, to begin    C. is , to start  D. is ,start