If you don't understand something, you may research, study, and talk to other people _______ you figure it out.
| A． |
because |
B． |
though |
C． |
until |
D． |
since |
Sofia looked around at all the faces: she had the impression that she _____ most of the guests before.
| A．has seen | B．had seen |
| C．saw | D．would see |
James has just arrived, but I didn’t know he _______ until yesterday.
| A．will come | B．was coming |
| C．had come | D．came |
During his stay in Xi’an, Jerry tried almost all the local foods his friends ________,
| A．would recommend |
| B．had recommended |
| C．have recommended |
| D．were recommending |
Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.
| A．had left | B．would leave |
| C．was leaving | D．has left |
Because the shop _________, all the T-shirts are sold at half price in it.
| A．has closed down | B．closed down |
| C．is closing down | D．had closed down |