Look at the trees on both sides of the streets． They last spring．（ ）
| A． |
planted |
| B． |
were planted |
| C． |
were planting |
When in Rome， do as the Romans do． We should behave_____ when travelling a broad．
That's quite true．（ ）
A．probablyB．hardlyC．highlyD．properly
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