In doing scientific experiments one must be _______ careful with the instruments.
| A．other than | B．rather than | C．less than | D．more than |
In many people’s opinion, that company, though relatively small, is pleasant _______.
| A．to deal with | B．dealing with |
| C．to be dealt with | D．dealt with |
Let’s not wait any longer, he might not _______ at all.
| A．turn over | B．turn up | C．turn on | D．turn down |
Special attention should be paid _______ our earth from _______.
| A．to protect; being polluted |
| B．to protecting; being polluted |
| C．to protect; polluting |
| D．to protecting; polluted |
The roof fell _______ he had time to dash into the room to save his baby.
| A．after | B．as | C．before | D．until |
Rock climbing is _______ great fun. You will get close to _______ nature and take adventures at the same time.
| A．/; / | B．a; / | C．a; the | D．/; the |