Since it will take years to know the effect of genetically modified food, it’s more sensible to give it a second thought before we eat it, it?
| A．isn’t | B．is | C．won’t | D．will |
Words failed to ________ my feelings the moment I saw my long-lost sister.
| A．control | B．convey | C．exchange | D．affect |
Do you know how much time and effort they devoted________ such a complicated project?
| A．to complete | B．completed | C．completing | D．to completing |
When Helen saw his tutor nod ________ to her, she calmed down and went on with her performance.
| A．encouragingly | B．amazingly | C．interestingly | D．astonishingly |
Never before________ seen a girl who can swim as fast as Ye Shiwen.
| A．had we | B．we had | C．have we | D．we have |
English is difficult________. Nobody can learn to use it in a few minutes.
| A．learning | B．to be learned | C．learned | D．to learn |