On the topic of English grammar

1, everything can't be put before us. If you want to put it, it will be changed to all of us.

This sentence means that we must all eat, which is very important. Have to watch, have to watch, have to watch. So choose a.

2. In the first half, the teacher made a decision, but in the past tense, and in the second half, he asked for expert advice, but in the past perfect tense, indicating that the action of asking for advice occurred before making a decision, so he chose after.

3, weather forecast, forecast, is definitely something that will happen, so it is the future tense, but because the previous verb uses the past tense, it means that this sentence is said in the past, so will should be changed to the past tense to keep the tense consistent.

4. first exclude CDs. Flown is a past participle. If you use it, the sentence will lack elements. D passive, mismatched.

Period refers to a period of time, so there is no time for comparison, so we choose the simple present tense.

In our country, the police are respected by the masses. Passive, and it is a statement of general facts, so use the simple present tense, police is collective noun, and the verbs behind don't need situations. Just like people.