verybody is here, Let’s set off.

Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology

Most people are familiar with the idea that all matterin the universe ________ atoms.

“Meals on wheels”is a freeservice,___hot meals are delivered to elderly people whomay not be able to move around very easily[ ]

You________scold such a pupil who always keeps silent so seriously that you________hurt him