__ It is so late. Our son __________ be back . __ Don’t worry . I dare say he ________ have some extra work to do.
It’s not easy to change habits,________with awareness and selfcontrol,it is possible.
Don’t turn off the computer before closing all programs,________you could have problems.
I was glad to meet Jenny again,________I didn’t want to spend all day with her.
There’s no way of knowing why one man makes an important discovery________another man,also intelligent,fails.
I have heard a lot of good things about you________I came back from abroad.