—Sir, physics is too difficult for me. —Tom, work hard, _______ you’ll find it easy.
Come and________ a party with us.
— _______the door, please. —Come in please. The door _______.
Look! There is a pet dog on the playground. Let’s go and play with it.
Look! There are some children _______with a ball over there.
There ______ two English lessons tomorrow, please prepare for them.