【单选题】
The?( )?from?school?to?work?can be?difficult
【判断题】
Maths are very difficult to learn.
【单选题】
Do you know ______at the bus stop?
①
whom they are waiting for
③
whom are they waiting for
【单选题】
The human race has already paid a heavy price for its slow _____to environmental threats.
【单选题】
You had better avoid ___________ in a bus.
【单选题】
On the first day at work, he was ( ) with a difficult task.
【单选题】
How difficult it is ______ the modern world without oil.
【单选题】
Never get off the bus ____it has stopped.
【判断题】
Dont get off the bus until it will stop.
【单选题】
Every means _______ been tried to solve the difficult problem.