Mrs.Smith,please teach me how to draw on the computer today.—Oh,no. ____.You have to get familiar with the keyboard first.

It was the first time that I __________ the night face to face.

What would you do if _________ eighty-year-old man fell down in front of you? —-I don’t know. Maybe I will help him.

Where is Jack?.—–He______ be in the reading room .I saw him just now.

There ________ a big tree and many flowers in front of my house now.