Don’t touch your eyes, nose and mouth, because they aren’t covered by skin and can ________ the virus easily.
| A．pick up | B．take up |
| C．make up | D．bring up |
His mother happened _______ when his program was shown on Channel Young.
| A．watching TV | B．to watch TV |
| C．to be watching TV | D．being watching TV |
By the time he was ten, Edison _________ experiments in chemistry.
| A．had already done | B．already had done |
| C．was already doing | D．already did |
The businessperson wanted to sell his goods fast; ______, he chose his partner with great care.
| A．therefore | B．otherwise |
| C．for | D．however |
Do you know the man____ is talking with Tom?
| A．which | B．who | C．whom | D．whose |
A dictionary is a book ______ gives the meanings of words.
| A．which | B．who | C．whom | D．whose |