An interesting suggestion on how to measure the temperature on the moon has been .
| A．put on | B．put out | C．put down | D．put forward |
Since his retirement from teaching music in 2001, Mr. Smith ______ a good deal of time painting as an artist.
| A．spent | B．has spent | C．had spent | D．spends |
Lawrence Craven, a doctor from the US, introduced the idea in 1953 _______ aspirin has the potential to reduce the risk of heart attacks.
| A．that | B．when | C．which | D．why |
Keeping on doing good deeds brings us peace of mind, ________ is important for our happiness.
| A．which | B．that | C．what | D．it |
_______ I have never thought of getting a job in such a big company, I’ll have a go at it.
| A．Since | B．Unless | C．Once | D．While |
Not only _______ many people’s lives by reducing fever and helping stop pain, but there are also other things that aspirin can help with.
| A．has aspirin saved | B．has saved aspirin |
| C．aspirin has saved | D．saved aspirin has |