----Jack can’t concentrate on his lessons recently. ----Yes, that might _____ his low score in the last test.
It is _____ that Professor Smith will give us a lecture tomorrow.
_______ his research, man can set foot on the moon now.
The rest of the apple _________.
Only when his mother arrived ___________.
–Do you know the ____ woman by the chairman? --Yes. But could you introduce to me the man _____ by the reporters?