When a pencil is partly in a glass of water, it looks as if it ______.
| A．breaks | B．has broken |
| C．were broken | D．had been broken |
Modern science has given clear evidence ____ smoking can lead to many diseases.
| A．what | B．which | C．that | D．where |
Three young men have been arrested because they were caught ___ an old lady last night.
| A．robbed | B．to rob | C．rob | D．robbing |
______ a little earlier, you could have got a copy of his latest book.
| A．If you would arrive | B．If you arrived |
| C．Should you arrive | D．Had you arrived |
Don't be afraid to ____ help if you have any further problems.
| A．beg | B．hesitate | C．desire | D．seek |
All these actions by NATO ______ with the universally accepted international laws.
| A．contact | B．contract |
| C．connection | D．conflict |