So difficult ______ it to work out the problem that I decided to ask Tom for advice.
| A．I did find | B．did I find | C．I have found | D．have I found |
The decorations were so lovely that they _____ in a short time.
| A．sold out | B．has been sold out | C．were sold out | D．were selling out |
The students _____ are hard-working and ready to help others should be praised.
| A．who | B．whom | C．which | D．whose |
—What’s the noise outside?
—Some children_____ hide-and-seek in the yard.
| A．were playing | B．are playing | C．have played | D．played |
I couldn’t help feeling greatI put on the parachute and was pulled off the beach.
| A．even though | B．whether | C．while | D．the moment |
We are deeply impressed by the goal from the conferencethe average income will double by the year 2020.
| A．that | B．which | C．what | D．whose |