"She shook her head and started to walk on. He kept up with her."
"Wait for me. I can't keep up."
"Supermarkets can barely keep up with demand."
"I can't keep up with the rest of the class."
"If you can keep up with your class assignments, it means you can stay on schedule and finish all of your assignments on time."
"This piano piece sounds excellent; you must have practiced a lot. Keep it up!"
"I can』t remember the next line! Ah, I don』t know if I can memorize this poem by the end of the week. Don』t give up!"