__________cleaning the yard and making up the beds for the old, we also read newspapers for them and had chats with them[ ]

He has _______good knowledge of_____English language but not much of English history

There aschool here, but now it’s a big mall here.

______________ twice a year，whether it is a car，a bus or a truck，is the rule that every driver must obey in this city．

It was when we were returning home ________ I realized what a good feeling it was to have helped someone in trouble.