瑞典皇家科学院2010年10月6日宣布,美国和日本的三位科学家共同获得2010年诺贝尔化学奖,三位科学家在“钯催化交叉偶联反应”研究领域作出了杰出贡献。下面有关催化剂的说法不正确的是( )
- Will you take part in the Summer Camp this vacation?
- ________ .I'm not sure.( )
Certainly
Good luck
No problem
It depends
- Is that man your friend Tom?
- That man ________ be him,because he has gone to Canada.( )
can't
mustn't
needn't
had better not
- English is difficult ________ at the beginning.
- Yes,but if you keep ________ ,you can make progress.( )
to be learned;trying
to learn;trying
to be learned;to try
to learn;to try
Look!Julia as well as her sisters ________ a kite on the playground.( )
fly
flies
is flying
are flying
- I am worrying about our final exam these days.
- There is nothing to worry about ________ you work hard.( )
until
so that
as far as
as long as