I saw a boy in the supermarket yesterday, reminded me of my good friend.
| A．that | B．where |
| C．who | D．which |
______ reduce pollution，the government has made a policy to restrict the use of plastic bags in some areas．
| A．In order that | B．So as to | C．So that | D．In order to |
The boy always spent the whole day ______ in the room reading English during the holiday.
| A．locking | B．having locked | C．being locked | D．locked |
Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.
| A．before | B．once | C．until | D．unless |
The monument was built in honor of the explorer who was believed _____ the river.
| A．to discover | B．to have been discovered |
| C．to have discovered | D．having been discovered |
________ blood if you can and many lives will be saved.
| A．Given | B．Give | C．Giving | D．To give |