---Do you know if he ___to our party? ---I think he will if he ___free tomorrow.
---- The box is too heavy to carry. What’s in it? ---- Oh, it is ___________ books.
TFBOYS’ songs________sweet and many of us like listening to them.
----I will visit the Great Wall this month. ---- ________________________.
__________of them got lost. They found the village successfully.(成功地)
I _________ my key in the car and I couldn’t get into my house.