Jane’s pale face suggested that she _______ill, and her parents suggested that she ________medical examination.
| A．be; should have | B．was; have | C．should be; have | D．was; has |
—You can't imagine ________ fantastic fun online chatting is.
—Really？But it may cause a lot of trouble sometimes.
| A．what | B．how | C．why | D．so |
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 |
Engines are to machines ________ hearts are to animals.
| A．as | B．that | C．what | D．which |