从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。 1. —Look! You look so tired after you have climbed that high mountain, but why? —_____ the beautiful scenery at the top of it. A. See B. To see C. Seeing D. For seen 2. Generally speaking, the electric bike is not dangerous as _____, if _____ according to the instructions. A. reported; ridden B. reported; riding C. report; to ride D. reporting; to be ridden 3. If _____ carefully, your final exam will be successful. A. prepare B. prepares C. prepared D. preparing 4. E-shopping, when properly _____, can save us a lot of time and energy. A. to do B. is done C. doing D. done 5. Have you ever been embarrassed when _____ talking to yourself after your mobile phone battery runs out in the middle of a call? A. leaving B. left C. leave D. you leave 6. Be careful with such things. If you _____, you’ll drop them. A. don’t B. aren’t C. won’t D. do |