Things like electronics, glass or other ____ objects are often packed with an appropriate protective material to prevent damage.
| A．flexible | B．concrete | C．abnormal | D．fragile |
—Can you give me some advice on what I said just now?
—Sorry, my mind _____．
| A．has wondered | B．had wondered | C．is wondering | D．was wondering |
I’d appreciate _____ if you would like to teach me how to use the computer．
| A．that | B．this | C．it | D．you |
The government has to close those small factories to prevent the water of the river ______.
| A．polluting | B．from polluting | C．being polluted | D．polluted |
There are _____ products to be sold in the factory store. Which of the following is not correct?
| A．a large number of | B．a large amount of | C．quantities of | D．a great many |
He did not regret saying what he did but felt that he _____ it differently.
| A．could express | B．would express |
| C．could have expressed | D．must have expressed |