The tour pal lost his way in the mountain; ________ made things worse was that it began to rain.
| A．that | B．what | C．which | D．who |
We will make ________ clear that we attach increased importance to all schools sticking to that guidance.
| A．this | B．that | C．it | D．what |
Internet users are warned to be ________ about giving away personal information to strangers.
| A．cautious | B．anxious | C．particular | D．sensitive |
The managing director took the ________ for the accident, although it wasn't really his fault.
| A．charge | B．account | C．blame | D．cause |
—Car prices have been going down sharply in the last 20 years.
—It's not surprising because the law of market ________ the price of a product.
| A．is controlling | B．controls |
| C．has controlled | D．controlled |
Is he the only one of the students who ________ here just now?
| A．is | B．are | C．was | D．were |