He is tall, _____ his son is short.A. or B. while C. and
Tom will be old enough ________ to school this year.
– Where is your mother? -- She ________ to shanghai. She has ever ________ there twice.
________ have you been in this city? -- Ever since 2000.
It is ________ of people to help the disabled.
I have already _______ the novel for a week. I must return it _______ the library tomorrow.