______ yourself, you should never put convenience before safety.
| A．Protecting | B．Having protected | C．Protect | D．To protect |
Professor Li is the person to ____________ you should write.
| A．whom | B．who | C．which | D．whose |
Do you know the reason _______ he was late?
| A．that | B．which | C．where | D．why |
I’ll take you to the museum ______ you may see everything _________ you want.
| A．which; that | B．where; that |
| C．in which; which | D．where; what |
Is oxygen the only gas ________ helps fire burn?
| A．that | B．/ | C．what | D．it |
The number of the people present at the concert was _____ than expected. There were many tickets left.
| A．much smaller | B．much more |
| C．much larger | D．many more |