Chang’e2 did many experiments, ______ I think are of much help for knowing space.
| A．which | B．what | C．when | D．where |
a strange plant! I've never seen it before.
| A．Which | B．What | C．How | D．Whether |
When the news came the war broke out, he decided, to serve in the army.
| A．since | B．which | C．that | D．because |
Bring the flowers into a warm roomthey'll soon open.
| A． | or | B． | and | C． | but | D． | for |
around the fire, the tourists danced with the local people.
| A．Gather | B．To gather |
| C．Gathering | D．To be gathering |
He had no sooner finished his speech the students started cheering.
| A．since | B．as | C．when | D．than |