Witnessing the explosion(爆炸) in a chemical plant in Kunshan is the most frightening experience ______ I have ever had.
| A．that | B．when | C．which | D．who |
—Can I call you back at two o’clock this afternoon?
—I’m sorry, but by then I______ to Beijing. How about five?
| A．fly | B．will fly | C．will be flying | D．am flying |
--- Why do you want the book?
---- _________, sir.
| A．Studying | B．Studies | C．To study | D．Studied |
Her husband was _____ to make a fortune, but finally failed.
| A．proud | B．anxious | C．eager | D．content |
______he came back ______the truth.
| A．Not until; did he know | B．It wasn’t until; did he know |
| C．Not until; had he known | D．It wasn’t until that he had known |
The boy wanted to ride his bicycle in the street, but his mother told him_________.
| A．not to do | B．not to | C．not do it | D．do not to |