19．Vitamin D helps our bodies make a special chemical, and this special chemical,________,affects our brains, making us feel happy.
| A．in turn | B．in particular | C．in advance | D．in short |
---Bob, don’t be so ____. Sam doesn’t meant to hurt you.
---Oh, really?
| A．excited | B．tolerant |
| C．sensible | D．sensitive |
. Great ____have been made in the field of computer science in the past decades.
| A．progress | B．breakthroughs |
| C．mistakes | D．assessments |
If it ____tomorrow, I’d go downtown with my brother.
| A．isn’t raining | B．doesn’t rain |
| C．weren’t raining | D．has rained |
．I must make full use of the time ___left to me and do as much as I can for the people.
| A．there being | B．there is |
| C．there are | D．there to be |
With a final conclusion _____, the meeting ended at 4:30 p.m. last Monday.
| A．to draw | B．to be drawn |
| C．drawn | D．drawing |