4. 我很难分清这对双胞胎女孩。(tell...apart)

3. 他的妈妈反对这项新计划。(oppose)

2. 他的所作所为使我很失望。(let...down)

1. 只要不灰心，你迟早都会成功的。(as long as)

4. A bad habit is easily 　　　　(acquire)but broken up with difficulty.

3.　　　　　　 (investigate)and found blameless, he felt relaxed.

2.　　　　　 (debate)the problem heatedly, they didn’t hear me.

1. The government has time and again　　　　 (clarify)its position on equal pay for women.

3. The climate here doesn’t　　　　　 me.

2. We voted to　　　　　　 the latest pay offer.