—Sir, physics is too difficult for me. —Tom, work hard, _______ you’ll find it easy.
There are________people leaving the countryside to search________work in the city.
—Where is your English teacher?I’m looking for him everywhere. —He________for some information on the Internet in the computer room.
They________in the city since last summer.
I________at this school for two years already.
Those foreign friends left Guangzhou________.