___ the beginning of the meeting, the president made a speech ___ how to reduce pollution.
Millie is too young to ________ herself.
It’s more than 8 years since I a teacher.
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.