Recently I have bought an iPad 3 on the website of taobao. com, ________ the price is very reasonable.
| A．on which | B．in which |
| C．of which | D．from which |
If any employee is found information regarding applicants and staff， he or she will be fired immediately.
| A．having leaked | B．leaked | C．leaking | D．to be leaking |
The infrastructure of a country is makes everything run smoothly， including things like transport， irrigation， electricity， postal service， telephones and schools.
| A．that | B．what | C．which | D．as |
We should be able to do the job for you quickly， you give us all the necessary information.
| A．in case | B．provided that | C．or else | D．as if |
Someone is ringing the doorbell. Go and see .
| A．who it is | B．who is it | C．who is he | D．who he is |
It is said that the student seriously ill for two months last semester.
| A．was | B．is | C．had been | D．has been |