The questions listed here are just a few problems that teenagers may___
| A．come to |
| B．come about |
| C．come across |
| D．come through |
___ with various research projects, that scientist can’t even find time to visit his parents.
| A．Occupying | B．Occupied |
| C．To be occupied | D．To occupy |
— Thank God you’re safe!
— I stepped back, just ____ to avoid the racing car.
| A．in time | B．in case | C．in need | D．in vain |
— Don’t worry, Mum. The doctor said it was only the flu.
—____! I’ll tell Dad there’s nothing serious.
| A．What a relief | B．Congratulations |
| C．How surprising | D．I’m so sorry |
All flights ____ because of the snowstorm, many passengers could do nothing but take the train.
| A．had been canceled | B．have been canceled |
| C．having been canceled | D．being canceled |
As he works in a remote area, he visits his parents only ____.
| A．occasionally | B．anxiously |
| C．practically | D．urgently |