Scientists say it may be five or six years _____ it is possible to test this medicine to human patients.

So I rudely replied, “You’ve dialed the wrong number! ” and then ________.

_______ can a tiger weigh, do you know? — Yes, I know that a big one can weigh over 300 kilos.

The movie is quite interesting. — But I don’t think so,_____, it’s quite boring. [ ]

_____ the last day of this term, our school will organize a school leavers’ party. [ ]