My mother is a nurse(护士) and is good _____ kids .[ ]

Must I finish the homework tonight?—No, you.You can finish it tomorrow.

________is the bridge?-It’s three and a half kilometres.[ ]

My family ________ supper together every day. It’s really a happy time for all of us.

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