— girl is the exchange student from the UK? —Look, the tall girl under the tree over there is!
Don’t ___________ your dictionary all the time when you meet new words.
It is difficult __________ you ___________ finish the work in a week.
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.