Generally speaking, if ______ strictly following the instructions, the electric bike is not as dangerous as reported.
| A．riding | B．being ridden | C．to be ridden | D．ridden |
The boss insisted that every minute ______ made full use of ______ the work well.
| A．be; to do | B．was; doing | C．be ; doing | D．was ; to do |
Rather than _______ here waiting, I prefer _______to find out what on earth has happened.
| A．sit ; going | B．sit ; go | C．sitting ; go | D．sit ; to go |
The novel was concerned ______ the Second World War, while most readers are more concerned _____ the hero's love story.
| A．with; about | B．with; at | C．for; about | D．about; with |
The police chief advised his men to keep________ and not lose their tempers.
| A．calm | B．quiet | C．still | D．silent |
Generally speaking, ______according to the directions, the drug has no side effect.
| A．when taking | B．when taken | C．when to take | D．when to be taken |