Zhengzhou will be more and more convenient when Zhengzhou Subway_____ in two years.

Christina wasn’t saying anything, but the professor smiled at her _______she had done something very clever

tending to be ill, the candidate tried to run away from _______ issues, which always aroused too much debate.

It took him a long time to ______ the skills needed tobecome a professional artist.

Many students are about football． They play a game whenever possible．