The two girls are so alike that strangers find __________ difficult to tell one from the other.
---Is that the small town you often talk about?---Right, just the one ______________ you know I used to work for three years.
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.