______, I have never seen anyone who’s as capable as John．
| A．As long as I have traveled | B．Now that I have traveled |
| C．As I have traveled so much | D．Much as I have traveled |
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
— Oh, dear ! She ______ a lot of difficulties !
| A．may go through | B．might go through |
| C．ought to have gone through | D．must have gone through |
Helen ______ go on the trip with us, but she isn’t quite sure yet.
| A．shall | B．must | C．may | D．can |
The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.
| A．should | B．must | C．will | D．can |
— Tom is never late for work. Why is he absent today ?
— Something _______ to him.
| A．must happen | B．should have happened |
| C．could have happened | D．must have happened |
— Shall I give you a ride as you live so far away ?
— Thank you. _______.
| A．It couldn’t be better | B．Of course you can |
| C．If you like | D．It’s up to you |