It isn’t like a duck to water to learn a foreign language , so you must study hard.

Whose model plane is it—It’s Jack’s. He made it by _______.

Mr Smith _____the grammar book meant for senior high school students and will almost finish it.[ ]

Because of my _____ demands, father finally agreed to go to Australia with me. [ ]

The foreign customer ______ a polite request asking about the price of the flower vase,but the assistant looked puzzled, as she didn’t understand any English.[ ]