Joan spent as much time as she ________ me with my maths while I was in China.

The ______ of new inventions(发明) should be to make life easier, not to make it more difficult.

st decade of the 21st century________ the rapid, steady development of China in various fields.

It took them time to finish the challenging task.

As soon as I heard the news that I passed the driving test, I felt _______ at once.