If Tom had spent more time studying, he able to do well in the test now.
sales of cars up by 30% last year, the traffic in Beijing has become increasingly terrible.
It is recognized that the part ___ the UN plays in international relations is important.
Who would you rather ______ with the teacher about the problem?
When _____ the letter, tears came to her eyes.
Did he find _____ hard to learn a foreign language?