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 |
All of them felt it necessary that they______ __the meeting
| A．attend | B．would have attended |
| C．attended | D．were to attend |
－We had_____ really cold February this year
－I can’t remember_____ spring when it snowed in Changzhou.
| A． a;不填 | B．不填;the | C．the; a | D．a; a |
I have a lot to say in relation ______ _the affair.
| A．with | B．by | C．to | D．in |
On our arrival, we found Tom_____ at the desk with his hand ______ to the distance.
| A．seated, pointing | B．sitting, pointing |
| C．seating, pointed | D．seated, pointed |
Ten professors______ the medical team to look into the cause of the disease.
| A．composed | B．consist of | C．make up | D．forms |