Our neighbor offered to look after our baby yesterday when we were busy, _____is often the case.

idn’t go to Europe, why—I _____ this morning, but I _____ to Shanghai becauseof an emergency ．

I didn’t go to the party, but I do wish I ____there.

Chengdu has focused on improving the surrounding countryside, ________ encouraging large­scale city expansion.

ne knows that _______ is dangerous to play withfire, but _______ is difficult is to prevent children from playing with fire