.
Going on a trip to a far-away destination _________ be expensive and difficult, but it is very interesting.
| A．can | B．must | C．should | D．will |
We all know that, __________, the situation will get worse.
| A．not if dealt carefully with | B．if not carefully dealt with |
| C．if dealt not carefully with | D．not if carefully dealt with |
---How's your tour around the North Lake? Is it beautiful?
---Itbe, but it is now heavily polluted.
| A． | will | B． | would | C． | should | D． | must |
I won’t call you, ________ something unexpected happens.
| A．unless | B．whether | C．because | D．while |
---The last one __________________ pays the meal.
---Agreed!
| A．arrived | B．arrives | C．to arrive | D．arriving |
A---It's a long time since I saw my sister.
---her this weekend?
| A． | Why not visit | B． | why not to visit |
| C． | Why not visiting | D． | Why don't visit |