________ 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 |
The medical reform in that country turns out to be ______ failure, but as we know, success often comes after ______ failure.
| A．a; the | B．a; 不填 | C．a; a | D．不填; 不填 |
Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．seen |
It was raining heavily. Little Mary felt cold, so she stood ______ to her mother.
| A．close | B．closely | C．closed | D．closing |
______ loud music in public is against the law in the UK.
| A．Play | B．Having played | C．Playing | D．Being played |
They succeeded in killing pests which came from the foreign countries ______ a lot of hard work.
| A．according to | B．thanks to | C．in memory of | D．in addition of |