Is this the research center _____you visited the lab last year ?
| A． which | B． the one | C．that | D．where |
—Can you describe ___ it happened?
—Yes, I was riding on my bike ___ a car knocked me down from behind．
| A．when; as | B．how; as | C．how; when | D．how; while |
The train CRH380A, ___ trial operation on the Shanghai-Hangzhou high-speed railway, set a speed record of 416．6 kilometers per hour．
| A．started | B．to start | C．starting | D．being started |
We went to the West Lake yesterday, ___, not surprisingly, was crowded with visitors from all over the world．
| A．where | B．which | C．that | D．when |
—Mum, where is my raincoat?
—Oh, I forgot to tell you．It ___ behind the kitchen door．
| A．would hang | B．has hung | C．is hanging | D．hung |
The dining room is clean and tidy, with a table already___ for a big meal．
| A．laid | B．laying | C．to lay | D．being laid |