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 |
. ---- How long ____ at this job?
---- Since 1990.
| A．were you employed | B．have you been employed |
| C．had you been employed | D．will you be employed |
. ---- Do you know our hometown at all?
---- No, this is the first time I ____ here.
| A．was | B．have been | C．came | D．am coming |
They won the game, _______ made their team leader proud of them.
| A．that | B．which | C．it | D．all this |
His parents wouldn’t let him marry anyone ______ family was poor.
| A．of whom | B．whom | C．of whose | D．whose |
The first thing ________ we should do is to master the basic grammar.
| A．which | B．that | C．as | D．of which |