263. --- When will that opera be ______?
--- I don’t know. But I hope they can _____ next Sunday.
put on; put on it B. put on; put it on C. put off; put off it D. put in; put it in
If one succeed， one must put his heart into his career.
| A．will | B．is going to | C．is to | D．is about to |
The book was written in 1946， the education system has witnessed great changes.
| A．when | B．during which | C．since then | D．since when |
My wallet isn’t in my bag. Where I have put it？
| A．can | B．must | C．should | D．shall |
Many children may be fond of animals， but ever think of making the study of animals their career.
| A．a few | B．few | C．some | D．any |
The country has already sent up three unmanned spacecrafts， the most recent at the end of last March.
| A．has been launched | B．having been launched |
| C．being launched | D．to be launched |