The Great Wall winds its way _____ mountains _____ valleys and _____ deserts to the east.
| A．over; in; through |
| B．over; through; across |
| C．on; in; across |
| D．in; in; through |
The book is meant to ___needs it .
| A．who | B．whoever | C．whomever | D．whom |
The couple are spending their holiday on __is described as one of the most beautiful islands .
| A．that | B．what | C．which | D．where |
See the flag on top of the building ? That was ___ we did this morning .
A when B. which C. where D. what
It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.
| A．that | B．when | C．what | D．how |
A plan has been put forward __ more graduates should go to work in the country
| A．when | B．that | C．whether | D．how |