Do you know how much time and effort they devoted________ such a complicated project?
—Hi,Professor Li.What time is it now?Are we late? —_________.
—Let me introduce myself,I’m Albert. —__________.
—Do you mind my taking this seat? —_________.
—Hi,I’m glad to see you. —_________.
We should treasure friendship,for a friend is easier lost than _____. A.find B.to find C.finding D found