30. It is a good city for cycling because it is flat and ________is convenient for bikes.
| A．however | B．what’s more | C．therefore | D．Besides |
—May I smoke here?
—If you ________， choose a seat in the smoking section.
| A．should | B．could |
| C．must | D．may |
We can't use it to tie the goods because it ________ be broken at the weakest position.
| A．shall | B．may |
| C．can | D．would |
If the island ________ a tourist attraction, last week's earthquake would have caused far more deaths.
| A．remained | B．would remain |
| C．has remained | D．is to remain |
One of our rules is that every student ________ wear the school uniform while at school.
| A．might | B．could |
| C．shall | D．will |
—Why does Thomas speak through every discussion but never listen to the others?
—That's what he ________ do. We used to hate that, but are used to it now.
| A．ought to | B．can |
| C．will | D．might |