I’m still wondering__________ put the Christmas gift under my pillow.
— Look! How long ________ like this? —Three weeks! It’s usual here that rain _______ without stopping these days of the year.
I won’t tell the student the answer to the math problem until he ______ on it for more than an hour.
Ladies and gentlemen, please fasten your seat belts. The plane _______.
I _______ in London for many years, but I’ve never regretted my final decision to move back to China.
I was giving a talk to a large group of people, the same talk I _______ to half a dozen other groups.