______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
| A．If only | B．Although | C．As long as | D．As soon as |
Liaocheng, Shandong Pro. is a beautiful city, ____11 pay a three-day visit.
| A．which | B．where | C．to which | D．in which |
The teachers are doing what they _____ their stuaits.
| A．can to teach | B．can teach | C．can teaching | D．can to teaching |
They were _____ inventors than pure scientists.
| A．more | B．less | C．many | D．worse |
Old as the car is, _____ it works quite well.
| A．but | B．yet | C．so | D．however |
The stubborn boy didn't _____ so that he missed the chance.
| A．take advice | B．follow an advice | C．give some advice | D．ask for advice |