______ each other for long, the two brothers decided to meet soon.
| A．Not seen | B．Not having seen | C．Having not seen | D．Not seeing |
Only when I left my parents for Italy _______ how much I loved them.
| A．I realized | B． I had realized | C．had I realized | D．did I realize |
It was not until midnight _________ they reached the camp site.
| A．that | B．when | C．while | D．as |
— Did you meet with the famous space hero?
— ___________ I had come here earlier.
| A．If only | B．If not | C．But for | D．For fear |
The committee ______ five famous scientists put forward a valuable plan at the end of conference.
| A．was made up | B．was made from | C．made from | D．made up of |
They suggested that the library ________ open during the vacation.
| A．was kept | B．would be kept | C．is kept | D．be kept |