The book was written in _________ easy English _________ even primary school students could understand it.

--- This history book is of great value. --- Exactly. ____________ can be enjoyed from it ____________ you have a deep understanding of it, however. 

—Do you like singing      dancing?—I like singing.

Without friendship, one won’t be happy _____ he is very rich.

 —Mark, where do you work?            —I work in a company        sells cars.