You look so tired tonight. It's time you ___. A go to sleep B. went to sleepy C.go to bed D.went to bed
We walked as fast as we could,____ to catch the 9:30 train.
—See the gathering clouds outside? Please take this umbrella with you. — .
Scientists hope to____soon in their fight against heart disease.
We haven’t heard from her for long, so we give her_____for dead.
Does the amount of rain_____the growth of crops?