－Mom, I’m leaving. －It’s raining. You’d better ________ an umbrella with you. 

--- Will Helen come to my party tonight?--- I am not sure. She _______ go to the cinema with her father.

---Must I finish my homework now ?  ---No, you ________

 Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.

---These grapes look really beautiful. ----They ______! See the price $3.99 a pound. Very expensive, aren’t they!