_____ a reply, I decided to write another letter.
| A．Not receiving | B．Not received |
| C．Not having received | D．Having not received |
Knowledge through children’s own practice is lasting and will benefit them all their lives.
| A．acquiring |
| B．acquired |
| C．being acquired |
| D．acquires |
Students in the school get along well with each other though they come from different social and cultural.
| A．situations |
| B．occasions |
| C．cases |
| D．backgrounds |
Some people think it is waste of time to surf the Internet, while others have great appreciation of it.
| A．the; \ |
| B．the; a |
| C．a; a |
| D．a；＼ |
——May I help you? You seem to be having some problems.
—— , thanks. I think I can manage.
| A． All right |
| B．No problem |
| C．It’all right |
| D．There’s no way |
--- I love the Internet. I've come to know many friends on the Net.
--- . Few of them would become your real friends.
| A．That’s for sure |
| B．It’s not the case |
| C．I couldn't agree more |
| D．I’m pleased to know that |