The door opened and in we had never seen before.
| A．did a tall man come |
| B．a tall man did come |
| C．came a tall man |
| D．a tall man came |
To be honest, a lot of people attach great importance to ______rich and famous.
| A．become | B．have become | C．having become | D．becoming |
He is the first person you can think of to rely on, for he is always willing to ________ whoever is in trouble.
| A．cut out | B．figure out | C．test out | D．help out |
—Why do you look so worried?
| A．had left | B．has left | C．was left | D．has been left |
It won’t be quite a long time ________ your son is back, so don’t be worried.
| A．that | B．since | C．before | D．until |
—What's the matter with the man hanging his head there?
—Well，if you ________ know, he was caught stealing my bike.
| A．must | B．may | C．can | D．shall |