There are ________ people in the supermarket. It’s so crowded.
Tommy, _________ do you play the piano?—When my mom is at home, I have to every day, but she’s away this week!
If I were you,I__________ his offer.
Scientists are now working _ humanoids(类人生物) because they can help people alot. [ ]
It’s two and a half weeks since the exchange students __________ Taixing.