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【題目】Scientists know the number of birds by ____.

【題目】My mother can’t ________ English， but she can stories.

【題目】We need to ________ after eating to have good teeth.

【題目】The scientist has failed in the test many times, ______he never gives up.

【題目】—Which drink do you prefer, coffee or tea?

【題目】 —Any phone calls for me while I was away?

【題目】The students were singing happily_________ I passed the school hall.

【題目】Because people cut down many trees， elephants are ________ great danger.

【題目】—Will you get there by _____bike? —I will take _____bus.

【題目】My ____ moved into the new ____ yesterday.