________you’ve experienced it，you can’t understand how I felt.
| A．Once | B．Because |
| C．Unless | D．While |
The traffic in the city was ________today, so Mary got home earlier than usual.
| A．heavy | B．weak | C．serious | D．light |
--------What do you think of the book I lent you yesterday?
--------Oh, not too bad. It’s not too difficult_________.
| A．to read | B．to be read | C．reading | D．being read |
It is no longer _________it was 20 years ago, ________it was so poorly equipped.
| A．what; when | B．that; which | C．what; which | D．what; that |
We’re looking forward to _______a chance to watch the opening ceremony of the London 2012 Olympic Games.
| A．give | B．be given | C．giving | D．being given |
--------Have you asked somebody to repair the machine?
--------Oh, sorry, I forgot it. I _________for an engineer at once.
| A．am going to send | B．would send | C．have sent | D．will send |