I will never forget the day _____ we worked together in London．
| A．when | B．on that | C．which | D．while |
--- I’ve got your invitation. --- Oh, good. ______
| A．Thanks a lot | B．Can you come? | C．I’ll take it | D．May I help you? |
--- Can you find me _______ symbol of China? --- ______ Great Wall.
| A．不填, 不填 | B． a, A | C．a, The | D．不填, The |
Bob ________ with us together since he came to our school.
| A．have worked | B．has worked | C．worked | D．will work |
When I came into the teacher’s office, he ________ on the phone.
| A．was speaking | B．spoke | C．had been speaking | D．had spoken |
Tony decided to study abroad _______ he knew he would meet many difficulties.
| A．as if | B．because | C．unless | D．even if |