—Have you known Dr. Jackson for a long time?
—Yes, since she ______ the Chinese Society.
| A．has joined | B．joins | C．had joined | D．joined |
People around the world are ______ the Japanese government to face the history with a correct attitude now.
| A．answering for | B．pushing for | C．accounting for | D．caring for |
Dad decided to build a small tool room with a lock, ______ he would keep his best tools so my brother couldn’t reach them.
| A．that | B．which | C．what | D．where |
— Have our travel plans been decided?
— No, still ______.
| A．out of order | B．up in the air | C．in the case | D．in the way |
_____ there was no conclusive evidence, most people thought he was guilty.
| A．Since | B．While | C．When | D．However |
David was always ______ his best in any danger, but at that moment he froze.
| A．at | B．in | C．for | D．on |