Generally speaking，prices of daily goods through the Internet are lower than store prices.
| A．bought | B．are bought | C．buying | D．to buy |
We all know the truth ______ there are air, water and sunlight, there are living things.
| A．in wherever | B．where | C．that where | D．that |
Look at the mess the boys made! You _______ have taught them how to behave themselves.
| A．must | B．may | C．can | D．should |
_______ I paid a visit to this scenic spot, I was deeply attracted by its beauty.
| A．Firstly | B．For the first time |
| C．The first time | D．At first |
______ has an interest in the lecture can go for a ticket from the office next to the gate of the lecture room.
| A．No matter who | B．Whoever | C．Anyone | D．Those who |
The new China was founded in 1949, ______ great changes have taken place.
| A．since when | B．after which | C．in which | D．when |