________ with his work in the Satellite Launch Site,he could not spare any time to stay with his parents though they are very old.
—Would you like to go to the cinema with me tomorrow afternoon? —I’d like to, Mum, but I ________ to a party by Jane. It is her birthday.
I was about to walk over to Tom's seat when he ______ and left.
All the students in this school are required to ________ at least two lectures on how to study every month.
Your desk is covered with too many unnecessary things, including used papers and books. You’d better ________ some of them.
On arrival at the flood-stricken village, the PLA soldiers set ______ rescuing the villagers.