Carbon dioxide，which makes a________between us and the sun，prevents heat from getting out of the atmosphere easily，so the earth is becoming warmer.
| A．difference | B．comparison |
| C．connection | D．barrier |
Not until I came home last night ________ to bed.
| A．Mum did go | B．did Mum go | C．went Mum | D．Mum went |
It ____in this new hall ____ was just set up last month ________ we held an important meeting yesterday.
| A．is; which; that | B．was; which; what |
| C．is; that; which | D．was; which; that |
In order to find _______ better job, he decided to study _________ second foreign language .
| A．the; a | B．a; a | C．the; the | D．a; the |
She is becoming fat, _______ bothered her very much.
| A．which | B．that | C．it | D．of whom |
He told us whether _________ a picnic was still under discussion
| A．to have | B．having | C．have | D．had |