____ is known to everybody, the moon travels round the earth once every month.
| A．It | B．As | C．That | D．What |
Most museums are just for looking. But today some of them have things for you to touch.The ＿＿say,“＿＿”
| A．signs; Do touch | B．notices; To touch |
| C．signals; Be touching | D．signs; No touching |
After chatting online for along time, Mary looked up, ＿＿that it was 11：00 pm, long past her usual bedtime.
| A．to see | B．saw | C．seeing | D．seen |
He is a strict but kind teacher, ＿＿my son loves and respects.
| A．one | B．he | C．the one who | D．he who |
-I've studied watching birds as one of my interests. Could I make some suggestions?
――＿＿
| A．You will make it | B．It doesn't matter |
| C．Go right ahead | D．Take it easy |
David said that it was because of his strong interest in literature＿＿he chose the course.
| A．that | B．what | C．why | D．how |