He______to a waiter, who got the message and brought the bill.
About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are put into effect.
---_________________---Thank you. I certainly will.
When you go by train, please see to it_______ you take an express, _______ that stops only at big stations.
She had to lie to the company and ______ a man in order to get a job, ______ rather strange.
The little girl couldn’t ________ the problem. She wasn’t ________ clever.