—Where is your uncle?—He _____ to South Africa on business. He has ______ there twice.
-Where is Susan?-Oh, she lives in England, so I ____________see her.
Most students in China go to school __________their bikes
. –My pet dog died yesterday.--- ________.
. Lily isn’t as _____as David.She often makes mistakes in her homework.
Mr smith has two children.One is a teacher and________ is a doctor.