Though he has studied ____ at Russian for ten years,he can still _____speak the language.

This is his only request that the room ______ after being used.

What do your parents often remind you _____?—They often tell me to hold on _____ my dreams.[ ]

He found ______ very helpful to memorize the words of some popular English songs.

What’s wrong with my son, doctor? — ____________ serious, just a slight cold. He’d better drink some water.