—Hi．Danny! Are you going for a picnic this weekend?
—I’m not sure._____________．
| A．It all depends | B．Yes．I’d like to |
| C．Sounds good | D．Sorry，I can’t |
I refuse to lie about it; it’s against my ________.
| A．potentials | B．principles |
| C．performances | D．procedures |
John Logie Baird constructed the first color TV in 1928, but it was not until 1938 ______ the first color TV programme was broadcast.
| A．when | B．what | C．which | D．that |
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 |