－Excuse me, does Mr Smith’s son live here?
－He _________ be here, but he has moved.
| A．has to | B．used to | C．tried to | D．happened to |
—It’s difficult to get to the other side of the river．
—I think a bridge ________ over the river．
| A．should be built | B．should build |
| C．will build | D．has built |
She said she returned the book to the library．I'm sure she ________．
| A．did | B．does |
| C．is | D．was |
一Do you know why he didn’t ________ a word when he ________ to?
—Because he was too nervous．
| A．speak；speaks | B．say；Was spoken |
| C．say；spoke | D．speak；is spoken |
—Do you know the price of the ticket?
—Yes．Each ________ ￥180．
| A．pays | B．costs |
| C．takes | D．spends |
You mustn’t go off on your own，because you ________ get lost in the mountains．
| A．should | B．must |
| C．need | D．might |