______ students are required to take part in the boat race.
Although the first part of the book is easy, the rest ______.
----Where are you now? ----Well, I have arrived at _______ is called “the West lake”.
If you want to improve your oral English, you’ll first have to _______yourself of those shortcomings.
It was ________ he came back from Africa that year _________ he met the girl he would like to marry.
Though the professor tried his best to explain the difficult question, the students still looked _____.