It was ______ten o’clock ______he returned home.
—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.
Mistakes don’t just happen; they occur for a reason. Find out the reason, and then making the mistake becomes ______.