19．We’d better set off now, or it will be dark__________we know it.
| A．until | B．after | C．when | D．Before |
Our English teacher recommended that we ________ an English dictionary.
| A．bought | B．must buy | C．buy | D．would buy |
I don’t think he is right, ________?
| A．do I | B．don’t I | C．is he | D．isn’t he |
I shall never forget the day __________ Shen Zhou V was launched, _________ has a great effect on my life.
| A．when, which | B．that, which | C．which, that | D．When, that |
You should go to see him when he is so seriously ill.________, he is your brother.
| A．Because | B．After all | C．At all | D．Above all |
This story is well worth ____________.
| A．to read | B．being read | C．to be read | D．reading |