--Nice to meet you!-- !
I can’t understand ____________ the boy alone.
They asked many questions ___________ had nothing to do with that topic.
_____________ is necessary __________ he trains himself before the Guangzhou Marathon.
___________ a sportsman is a hard job, but you are very excited if you are successful in ____________a good medal.
---Which do you like ___________ , apples or pears? --- I like pears.