.Miss Yang is ill.____ is why I have come here to give lesson.
| A．It | B．That | C．There | D．This |
With the help of high technology, more and more new substances ______ in the past years.
| A．discovered | B．have discovered |
| C．had been discovered | D．have been discovered |
--- Guess what! I have got A for my term paper.
--- Great! You ______ read widely and put a lot of work into it.
| A．must | B．should | C．must have | D．should have |
--- Did you tidy your room?
--- No, I was going to tidy my room but I ______ visitors.
| A．had | B．have | C．have had | D．will have |
Alan is a careful driver, but he drives ______ of my friends.
| A．more carefully | B．the most carefully | C．less carefully | D．the least carefully |
The mayor has offered a reward of $ 5000 to ______ who can capture the tiger alive or dead.
| A．both | B．others | C．anyone | D．another |