He let me repeat his instructions_____ sure that I understood what was _____ after he went away.
| A．to make; to be done | B．making; doing | C．to make; to do | D．making; to do |
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 |
After three hours’ climbing , they reached they thought was the place they’d been dreaming of .
| A．what | B．which | C．where | D．that |
--- The patient looks much better. is it that has made him he is today?
--- Perhaps the special medicine and his family’s patient care.
| A．What; that | B．That; that | C．What; what | D．What; which |