- Where have you been all day?- We _________ some beautiful children and we couldn’t get away from them until it was dark.
Teachers have to constantly update their knowledge in order to maintain their professional ________.
—China is developing rapidly. —Yes, to make our country more prosperous, we should firmly the principle of scientific development.
Saving and recycling are long-term projects _______ determination matters a great deal.
Jack wasn’t saying anything,but the teacher smiled at him ________he had done something very clever.
US President Barack Obama ________ a national speech at the 10th anniversary of 9/11 terror attacks.