__________ the task, they had to stay in the lab for another two hours.
| A．Not completing | B．Not completed |
| C．Not having completed | D．Having not completed |
____ wisest alternative is to work hard today in order that we will enjoy ____better tomorrow.
| A． The;the | B． A ; a | C． The ; a | D． A ; the |
I have always wanted to go to a good place in the country for a holiday , and now I___about where it should be.
| A．thought | B． had thought | C． was thinking | D． am thinking |
___Hi, Tom._____?
___ well .Long time no see! I miss you very much.
| A． What are you doing | B． What is going on |
| C．How do you like it | D． How is it going |
A car engine cannot run smoothly without motor oil.____ our body cannot function efficiently without vitamins.
| A． fortunately | B． Gradually | C． Similarly | D． Confidently |
Moreover,27.6 percent of those ____preferred reading on their mobile phones, which was 4.6 percent higher than last year.
| A． surveying | B．to survey | C． surveyed | D． having surveyed |