In order to finish the experiment successfully, the professor always _________, for every day the light in his room didn’t go out until 4 a.m.

Peter has bought another new phone again in this month—It’s just ________ of him to lose interest and waste money.

Everybody in the village knew him，so we had his home．

Seems you are quite familiar with Russia—That is because I _________ the country in1999

When we climbed up to the top of the mountain, we were all _______.[ ]