__May 5th，2017，the C919 took off successfully for the first time at Shanghai International Airport．（ ）
| A． |
On |
B． |
In |
C． |
At |
D． |
Of |
He hardly had friends because he used to be mean．
But now he has changed a lot． He treats others _______ and is popular．（ ）
A．nicelyB．carelessC．rudelyD．heavily
Time past can not be called back again．
Yes， Wasting time is a _____．（ ）
A．pressureB．fairnessC．choiceD．shame
Lucy， you can't use the phone _______ we are far from the gas（天然气） station．
OK， I won't do that again．（ ）
A．afterB．whenC．thoughD．until
A little bird entered through the open window to join us for dinner last night．
Wow， the unexpected guest ________ welcomed．（ ）
A．will beB．must beC．won't beD．mustn't be
Did you _______ the International Marathon in Lan Zhou on June 2，2019？
Of course． How exciting! （ ）
A．watchB．reviewC．supposeD．discover