__________ you understand the rule, you will have no further difficulty.
| A．While | B．Once | C．Though | D．Unless |
The girl has a great interest in sport and ________ badminton classes twice a week over the last three years. (2013·福建，26)
| A．took | B．is taking |
| C．takes | D．has been taking |
—Oh no！We’re too late.The train________.
—That’s OK.We’ll catch the next train to London. (2013·山东，27)
| A．was leaving | B．had left |
| C．has left | D．has been leaving |
—I don’t understand why you didn’t go to the lecture yesterday afternoon.
—I’m so sorry.But I________my homework. (2013·湖南，34)
| A．had done | B．was doing |
| C．would do | D．am doing |
If nothing________，the oceans will turn into fish deserts. (2013·湖南，26)
| A．does | B．had been done |
| C．will do | D．is done |
Around two o’clock every night，Sue will start talking in her dream.It somewhat________us. (2013·湖南，24)
| A．bothers | B．had bothered |
| C．would bother | D．bothered |