Question

1 He missed the bus.Therefore, he was late for class this morning
=>Since
2 Let's wear medical masks when going out in public places to prevent Coronavirus
=>We suggest medical masks
3 They speak English well
=>They are
4 Don't hope to be successful with trying your best
=> If

Answer 1

1 Since he missed the bus, he was late for class this morning

2 We suggest wearing medical masks when going out in public places to prevent Coronavirus

3 They are good at speaking English

4 If you don't try your best, you won't be successful

Answer 2

1 He missed the bus.Therefore, he was late for class this morning
=>Since he missed the bus, he was late for class this morning
2 Let's wear medical masks when going out in public places to prevent Coronavirus
=>We suggest medical masks should be worn when we go out in public places to prevent corona virus
3 They speak English well
=>They are good English speakers
4 Don't hope to be successful with trying your best
=> If you don't try your best, don't hope to be successful