Scientists say they are beginning to _____ in the fight against cancer.
| A．break in | B．break out | C．break down | D．break through |
—Would you like to climb mountains with me this Sunday?
—I’d love to. But I _______ play table tennis against Class Three.
| A．am going | B．am going to | C．am | D．going to |
--- We have won the science competition!
---Really? __________________!
| A．What bad news | B．I’m sorry to hear that |
| C．Congratulations | D．It’s only good luck |
---Millie，is there anything else you want to know about Huaguo Mountain?
---Yes，I am still wondering __________ .
| A．how can I get there |
| B．what should we do to make it more beautiful |
| C．how many monkeys are there in the mountain |
| D．if the tickets for students are less expensive |
— I know smoking is bad for my health， ____ I just can’t give it up.
— It is easier said than done.
| A．for | B．or | C．but | D．so |
I won’t leave the classroom until my homework ______.
| A．finishes | B．is finished |
| C．will finish | D．are finished |