---Where were you when I called at your house this morning?
---Oh, I_____ for a friend from Tokyo at the airport．
| A．had waited | B．am waiting | C．have waited | D．was waiting |
Our school_____ the 50th anniversary of the founding of CCFLS on October 5th, 2013.
| A．detected | B．activated | C．spotted | D．celebrated |
When the telephone rang, I happened_____ a book.
| A．to be reading | B．to read | C．read | D．to have read |
The boy wanted to ride his bicycle in the street, but his mother told him_____.
| A．not to do | B．not to | C．not did it | D．don’t do it |
Please put on the coat, _____ you’ll catch a cold.
| A．so | B．otherwise | C．but | D．because |
Try to_____ at least an hour each day for learning English and you’ll make progress.
| A．set about | B．set against |
| C．set aside | D．set apart |