The users of this new mobile phone can check e-mails _____ they happen to be.
| A．whatever | B．wherever | C．what | D．where |
People try to avoid public transportation delays by using their own cars, and this creates further problems.
| A．in short | B．in case | C．in doubt | D．in turn |
Scientists are convinced the positive effect of laughter physical and mental health.
| A．of; at | B．by; in | C．of; on | D．on;at |
This is a junior school.You should go to a senior school _____girls of your age.
| A．for | B．about | C．from | D．to |
__ unemployment and crime are high, it can be assumed that the latter is due to the former.
| A．Before | B．Where | C．Unless | D．Until |
______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
| A．Although | B．As long as | C．If only | D．As soon as |