Whenever they were busy with their own business, Sam, feeling _________, would go out for a walk or a cigarette.
| A．kept off | B．cut off | C．left out | D．at ease |
The warning we were given as children ________ an apple a day keeps the doctor away may，in fact，have a scientific explanation.
| A．that | B．who | C．where | D．which |
WalMart，the world's largest retailer(零售商)，sells in three months ________ the numbertwo retailer Home Depot sells in a year.
| A．that | B．which | C．when | D．what |
Professor Tang didn't give us a speech today.It was ________ he had a traffic accident on the way to school.
| A．that | B．when | C．why | D．because |
He taught his father how to get to know ________ is going on in his university life on the Internet.
| A．how | B．that | C．what | D．which |
It is obvious ________ the former Libyan government will be replaced with the opposition government.
| A．who | B．where | C．which | D．that |