--Will you two go to the show tomorrow?---No. We're going to a lecture, or at least I'm planning ____.
In a Han Dynasty tomb, they found some precious jars and vases, _______ are valuable.
I cannot _______ that all of the students will enjoy your classes. After all, students’ tastes vary.
_______no doubt that a green campus plays an important role in the growth of students, both physically and mentally.
How nice it _______ if I _______ an elder brother like you!
An engineer has designed _______ robot that can work in _______ deep sea to clean waste.