---Spacecraft “Discovery” has failed in the course of launch.
----_______? They have been preparing for the test.
| A．How come | B．When | C．How | D．Why not |
The young man who we talked a lot about yesterday is unfit for the work, _____?
| A．didn’t we | B．did we | C．is he | D．isn’t he |
---- You have never seen an American film, have you?
---- ________. How I wish I had such a chance!
| A．Yes, I have | B．Yes, I haven’t | C．No, I have | D．No, I haven’t |
________ if you want to do something, or you won’t be able to do it well.
| A．To try your best | B．Trying you best | C．Try your best | D．Unless you try your best |
--- Father, I’m going out for a play.
---- _________ be long!
| A．Don’t | B．It won’t | C．Won’t | D．You didn’t |
_______ your mind and you will find the way.
| A．Using | B．Use | C．If you use | D．To use |