The train is to start soon and Mary hasn’t turned up． What _____ have happened to her?
| A．can | B．might | C．may | D．should |
There is argument on the spreading easy access to Internet.
| A．不填，the | B．an;the | C．the;an | D．the;不填 |
—Hey，you haven't been acting like yourself．Everything is OK?
—.
| A．Sure, it is | B．I'm fine，thanks | C．That's good | D．It's a pleasure |
Cheer up! Everyone may have periods in their liveseverything seems tough．
| A．which | B．where | C．when | D．that |
．piano is her main focus，she's also great at guitar．
| A．Since | B．Once | C．Unless | D．While |
With the nuclear crisis worsening in Iran, the world's attention is fixed again onis called the Middle East．
| A．which | B．that | C．what | D．it |