A clean environment can help the city bid for the Olympics, which ______ will promote its economic development.
| A．in turn | B．in fact | C．in return | D．in nature |
—I drove to Zhuhai for the air show last week.
—Is that ________ you had a few days off?
| A．why | B．when | C．that | D．where |
It is generally considered unwise to give a child ________ he or she wants.
| A．however | B．whatever | C．whichever | D．whenever |
________ made the school proud was ________ more than 90% of the students had been admitted to key universities.
| A．What；because | B．What；that |
| C．That；what | D．That；because |
—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 |