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 |
— I’ve just been to my first language class.
— Oh really? ________ . Which language are you studying?
| A．So do I | B．So have I | C．So I do | D．So I have |
The price ________, but I doubt whether it will remain so.
| A．went down | B．will go down | C．has gone down | D．was going down |
----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 |
----What’s your first impression ________ Mrs Wang?
----She looks serious. I think she’ll be strict _____ us _______her own work.
| A．on; in; with | B．on; with; with | C．of; with; in | D．of; in; in |
It’s impossible for ____ few people to finish ____ a lot of work in only two days.
| A．such; such | B．so; such | C．such; so | D．so; so |