______ from the space, you will find the earth is blue.
| A．Seen | B．Seeing | C．See | D．To see |
Peter, together with his parents_________every Sunday.
| A．went hiking | B．go hiking | C．goes hiking | D．hiking |
It was not until everybody was present __________the party started.
| A．that | B．what | C．when | D．Where |
If I had tried my best last term, I ________more progress then.
| A．could make | B．would make | C．must have made | D．could have made |
---The Bird's Nest, isn't it?
---Yes. It's ___________we visited during our stay in Beijing.
| A．where | B．what | C．when | D．That |
---Did you have _______fun in Australia?
--- Sure. It was ___________ unforgettable experience.
| A．a; an | B．不填；the | C．the; an | D．不填； an |