Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _____ introduced the idea in 1953 _____ aspirin could reduce the risk of heart attacks.
| A．them; when | B．which; that | C．what; that | D．which; when |
25. Now I’ve been out of ______ work for weeks, I’ve joined the ranks of ______ unemployed
| A．the; / | B．the; the | C．/; the | D．/; an |
We decided to ______ a chance on the weather and have the party outdoors.
| A．make | B．take | C．have | D．pick |
The thief had himself _____ by the police when he was trying to break into the hotel.
| A．to spot | B．to be spotted | C．spotted | D．being spotted |
The reason was _____ I was busy with my work at that time.
| A．why | B．because of | C．that | D．what |
The problem is _____ will go.
| A．that | B．when | C．who | D．whoever |