Once a decision has been made, all of us should ______ it.
| A．directto | B．stickto | C．leadto | D．referto |
_____ he works hard, I don’t mind when he finishes the experiment.
| A．As soon as | B．As well as | C．So far as | D．So long as |
Antarctic _____ we know very little is covered with thick ice all the year round.
| A．which | B．that | C．where | D．about which |
They decided to chase the cow away _____ it did more damage.
| A．unless | B．until | C．before | D．although |
We often think of the days _____ we spent together on the island.
| A．when | B．which | C．in which | D．during which |
After supper she would sit down by the fire，sometimes for _____ an hour，thinking of her young and happy days．
| A．as long as | B．as soon as | C．as much as | D．as many as |