We should try every effort to prevent violence from happening at school, ______ more and more students would drop out of school ______ their personal safety could not be guaranteed.
| A．though; if only | B．though; so long as | C．for; now that | D．for; if |
If their marketing plans succeed, they ____ their sales by 20 percent.
| A．will increase |
| B．have been increasing |
| C．have increased |
| D．would be increasing |
If the weather had been better, we could have had a picnic. But it ____ all day.
| A．rained | B．rains | C．has rained | D．is raining |
We first met on a train in 200We both felt immediately that we ______ each other for years.
| A．knew | B．have known | C．had known | D．know |
So far this year we ______ a fall in house prices by between 5 and 10 percent.
| A．saw | B．see | C．had seen | D．have seen |
The flowers were so lovely that they __________ in no time.
| A．sold | B．had been sold | C．were sold | D．would sel |