固定翼无人机相比旋翼无人机来说,对跑道的要求低,使用范围广泛()
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Choose the best answer to complete each sentence._______ late again, Bill!
A. Don't to be
B. Don't be
C. Not be
D. Be not
________ me an e-mail before you come to Hangzhou. I’ll meet you at the airport.
A. Sending
B. To send
C. Sends
D. Send
________ to smile at your life when you are in trouble, and you will soon be happy again.
A. Try
B. To try
C. Trying
D. Tried
--- Jack, don’t always copy what others do. ________ your head, please.--- Thanks for telling me.
A. Using
B. Used
C. Uses
D. Use