.I was about to get on the bus __________my wife phoned me to back home at once.

Math is too difficult. I want to give it up. —Please don’t. Nothing is _________if you put your heart into it.

Look! There are many apples _______ the tree and some birds are _______ the tree, too. [ ]

Li Lei often takes care of the old woman after school.

I am looking after Tom today.He’s been in my house ______________ 8:00 this morning.