Where is your uncle，Jane？
He is in Guangzhou．He ______ for a month．（ ）
A．has leftB．has gone
C．leftD．has been away
What's wrong with your forehead（前额）？
I knocked my head on the tree while I _____my dog．（ ）
A．walkedB．was walking
C．has walkedD．am walking
Yuan Longping's ______to our country is amazing．
I agree． He and his team even start to plant saltwater rice．（ ）
A．celebrationB．conversation
C．contributionD．collection
An AI robot _____in our school dining hall next term．
I'm looking forward to it．（ ）
A．will useB．will be used
C．is usedD．was used
I hear there will be a Peppa Pig Theme Park in Shanghai．
______big surprise!（ ）
A．What aB．WhatC．HowD．How a
Though Mr． Li _____his hometown for over ten years， he misses his old friends from time to time．（ ）
A．has leftB．has been away from
C．was away fromD．left