---Is Sarah coming ?
--- No. She should have let us know earlier , but _______ she has been very busy recently.
| A．to be sure | B．to be honest | C．to be fair | D．to be exact |
You mustn’t lose heart; sooner or later your efforts will ________．
| A．pay off | B．take off | C．give off | D．set off |
Hardly ________ the plane when I was warmly welcomed by a text from the lovable Mikey．
| A．did I step off | B．I stepped off | C．had I stepped off | D．I had stepped off |
It will be one of the nations worst affected by climate change, as________ of the country ________ below sea level．
| A．two-fifth; is | B．two-fifth; are | C．two-fifths; is | D．two-fifths; are |
Mr Wang ________ in our school for ten years．Now he has got a job in Australia．
| A．worked | B．is working | C．had worked | D．was working |
I can’t tell which is better, ________ I am a green hand．
| A．but | B．so | C．or | D．for |