—Excuse me，is this the right way to the bookstore？
—Sorry，I’m not sure．But it________be．
| A．can |
| B．need |
| C．must |
| D．might |
Mr Smith always goes for a walk with his dog when he is_________.
| A．busy | B．free | C．health | D．alone |
—There will be ________ factories in 100 years.
—Really? Where will people work then?
| A．not any more | B．no more | C．not more | D．less than |
Planes will be very large______ flying will be very cheap.
| A．because | B．so | C．but | D．and |
There is going to _______ a basketball match this weekend.
| A．have | B．has | C．be | D．is |
Betty always ________ me some questions but I can’t answer all of them.
| A．wants | B．asks | C．meets | D．knows |