…….the experiment several times, the scientists finally succeeded in developing a new vaccine.

I picked up some holiday brochures________ around the table at the travel agency.

If_______ with pictures and diagrams, a lesson will be more interesting and comprehensible.

______ a job in a small company, he turned it down and kept on applying for a more suitable one.

I picked up some holiday brochures________ around the table at the travel agency.

Even little things like turning off the lights when not in use can make a difference to the amount of electricity _____.

______ a big fine for speeding, the driver felt very sorry thinking if only he had followed the traffic rules.