After Yang Liwei succeeded in circling the earth, Chinese astronauts __________ walk in space.
In the face of _____ failure, it is vital that we should keep up _____ good state of mind.
What he said just now ___________ me of that American professor.
Rather than ________ abroad with her parents, she preferred __________ volunteer work during the holiday.
A library with five thousand books ____________ to the nation as a gift.
The experts advised ____________ our army ____________ modern weapons.