Up to now, our society ________ with limited living space and a shortage of natural resources.
| A．has been challenged | B．is being challenged |
| C．is challenging | D．has challenged |
--- What about__________concert?
--- It was too boring, you know, ________concert for me.
| A．a; the | B．the; the | C．a; / | D．the; a |
Ali said that she wouldn’t mind _________ alone at home.
| A．left | B．being left | C．to be left | D．leaving |
The sentence needs __________ once more.
| A．to explain | B．explaining |
| C．being explained | D．to be explained it |
The village has developed a lot ___ we learned farming two years ago.
| A．when | B．which | C．that | D．where |
I was not _______her presence till she spoke to me.
| A．aware | B．aware about | C．aware of | D．aware to |