My father has decided to ________ smoking.—That’s good news for us.

We all find ________dangerous to skate on the thin ice.

Let’sgoclimbingthemountainsifit ______thisweekend.—Butnobodyknowsifit ______.[ ]

As the intelligence of robots increases to match ________ of humans，we may use them to expand our frontiers.

Must I finish my homework now?—No, you _______.